Kev sib tiv tauj nrog kev tiv thaiv hluav taws xob
Ua ntej, kev tiv thaiv ncaj qha rau kev tiv thaiv hluav taws xob
(1) Raws li ib txwm muaj, cov khoom siv hluav taws xob tsis raug sib cais ntawm cov hlau, xws li hlau, daim hlau thaiv thiab hlau ua haujlwm, thaum muaj kev sib tsoo, lub plhaub thiab lwm yam hlau luv luv Circuit Court txhaum tshwm sim thaum sib chwv qhov txaus ntshai voltage, qhov no lub sij hawm Tib neeg raug cov khoom qhov hlau, uas hu ua kev sib chwv nrog hluav taws xob.
(2) Cov khoom siv hluav taws xob, kab thiab lwm yam tsis ua tiav, txhawm rau kom zam kev raug mob rau tus kheej vim los ntawm hluav taws xob kev sib tsoo, hu ua kev sib txuas lus nrog kev tiv thaiv hluav taws xob, lossis hu ua kev tiv thaiv ntawm kev sib cuag nrog lub cev raug foob.
(3) kev sib txuas lus nrog kev tiv thaiv hluav taws xob tiv thaiv yog cov hauv qab no:
Tsis siv neeg fais fab mov txiav-tawm (tiv thaiv hauv av txhaum).
Kev siv hluav taws xob ob chav lossis lub rwb thaiv tsev tiv thaiv hluav taws xob (piv txwv li equipment cov khoom hluav taws xob qib).
③ yuav ua chaw txaus ntshai ntawm hluav taws xob kev rwb thaiv tsev, ua rau thaj chaw tsis muaj qhov cub.
Kev siv ntawm qhov tsis yog av hauv cheeb tsam kab ke tiv thaiv kev tiv thaiv, lossis ua kom ntsuas qhov ntsuas equipotential.
⑤ siv qhov tshwj xeeb ultra-low voltage.
Kev siv hluav taws xob cais.
Thib ob, qhov nruab nrab ntu thiab xoom, kab nruab nrab thiab qhov sib txawv ntawm xoom kab
Thaum lub hwj huam muab sab (hloov hluav taws xob lossis tshuab hluav taws xob) lossis cov load sab rau ntawm lub hnub qub lub tshuab hluav taws xob, thawj qhov kawg ntawm peb-theem kauj (lossis tw) txuas ua ke raws li kev sib koom tes sib txuas, hu ua nruab nrab. Nruab Nrab Tsis Nruab Nrab Qhov Nruab Nrab Qhov taw tes thiab thauj khoom nruab nrab. Los ntawm kev nruab nrab kis ua rau txoj kab nruab nrab, raug xa mus rau hauv nruab nrab kab.
Yog tias qhov nruab nrab ntawm tus taw tes thiab cov cuab yeej hauv av txuas nrog ncaj qha kom tau lub ntiaj teb' s siv qhov ntsuas xoom, qhov nruab nrab nruab nrab yog hu ua "zero point", cov hlau los ntawm xoom txhuas yog hu ua xoom txoj kab.
Feem ntau 220 volt ib-theem Circuit Court ob kab hauv ib qho hu ua" theem kab" lossis" FireWire", thaum lwm kab hu ua" xoom kab" lossis" av."" FireWire" thiab" av" hauv lub npe, tab sis ib qho kev coj ua hauv lub npe, tshwj xeeb," av" yog tsis yog. Hais lus nruj, nws yuav tsum yog, yog tias hluav taws xob Circuit Court sab (peb-theem kev faib tawm transformer nruab nrab kis) yog grounded, hu" xoom kab" yog tias tsis muaj av, yuav tsum raug hu ua" chaw nruab kab" txhawm rau kom tsis txhob muaj cov cuab yeej ntaus nrig Ua Kab" ;.
Thaum peb-theem kab, ntxiv rau peb theem kab, tab sis kuj coj los ntawm nruab nrab kis ntawm cov hlau, txoj kab nruab nrab, uas tsim peb-theem plaub-xaim Circuit Court. Cov kab nruab nrab ntawm cov theem kab hluav taws xob voltage, paub tias yog cov kab voltage, theem kab thiab qhov hluav taws xob nruab nrab ntawm txoj kab xoom hu ua theem voltage.
Yog nruab nrab ntawm cov ntsiab lus nruab nrab, tseem hu ua qhov nruab nrab point system. Qhov nruab nrab point system tuaj yeem muab faib ua ob pawg, uas yog, qhov nruab nrab taw tes qhov nruab nrab cov kab ke thiab nruab nrab cov kab sib cais. Raws li cov kev cai ntawm International Electrotechnical Commission (IEC), cov hluav taws xob faib hluav taws xob tsawg tau muab faib ua NWS, TT, TN peb yam, ntawm cov TN uas tau muab faib ua TN-C, TN-S, TN-CS peb pawg.
Thib peb, txhawm rau tiv thaiv hauv av
Qhov hu ua kev tiv thaiv hauv ntiaj teb, uas yog, cov khoom siv hluav taws xob nyob rau hauv cov ntaub ntawv ntawm tsis ua hauj lwm yuav muaj kev phom sij rau hauv av ntawm cov hlau seem (xws li lub plhaub, thiab lwm yam) nrog lub ntiaj teb thiab cov xaim hluav taws xob.
Yog tias cov cuab yeej hluav taws xob tsis zoo nkauj, qhov thaiv yuav ua kom muaj zog thaum ib feem ntawm nws cov rwb thaiv tsev puas thiab lub cev tib neeg yuav raug rau lub teeb meem hluav taws xob yog tias qhov hluav taws xob ntawm cov khoom hluav taws xob puas los ntawm lub rwb thaiv tsev no yog vim muaj lub peev xwm nruab nrab ntawm kab thiab lub ntiaj teb. Tom qab kev tiv thaiv ntawm cov cuab yeej hluav taws xob hauv av, hauv av luv-xov hluav taws xob tam sim no yuav nyob ntawm lub cev grounding thiab lub cev los ntawm ob kab. Grounding tsis kam yog feem ntau 4 Europe li hauv qab no, thiab cov tib neeg tsis kam yog txog 1000 Tebchaws Europe, yog li lub luag haujlwm ntawm kev tso tawm los ntawm lub cev hauv av ntws los ntawm lub cev' s tam sim no yuav luag sib npaug rau xoom, yog li zam qhov luv luv-Circuit Court txhaum hluav taws xob tam sim no hluav taws xob txaus ntshai.
Plaub, kev tiv thaiv xoom
Kev tiv thaiv kev tiv thaiv xoom hu ua xoom, yog cov khoom siv hluav taws xob nyob rau hauv qhov xwm txheej ntawm cov tsis muaj hlau qhov chaw (lub plhaub), nrog cov xov hlau thiab cov xov hluav taws xob tsawg faib cov xoom (kab nruab nrab) ncaj qha mus txuas rau kev tiv thaiv tus kheej kev nyab xeeb, los tiv thaiv. Hluav taws xob poob siab.
Kev tiv thaiv xoom feem ntau nrog lub fuse, tso tawm, thiab lwm yam, raws li qhov hluav taws xob qis-ncaj qha-nruab nrab lub hauv av thiab 380/220-volt peb-theem plaub-xaim system (hauv IEC tus qauv hu ua TN-C system).
Nrog kev tiv thaiv ntawm kev nkag mus rau xoom, thaum lub plhaub ntaus luv luv-Circuit Court, lub luv-Circuit Court tam sim no los ntawm kab theem los ntawm lub plhaub mus rau xoom kab, thiab tom qab ntawd rov qab mus rau qhov hloov nruab nrab kis. Raws li qhov txhaum Circuit Court tsis kam, reactance yog tsawg heev, yog li qhov txhaum tam sim no zoo heev, nws txaus los ua cov kab tiv thaiv cov cuab yeej (fuses lossis hloov mus) hloov ceev, uas yuav txiav tawm cov khoom siv fais fab, tshem tawm qhov txaus ntshai, ua si tiv thaiv nyhuv.
Txawm hais tias kev tiv thaiv hauv av thiab kev tiv thaiv ntawm kev nkag mus rau xoom tuaj yeem lav qhov kev nyab xeeb ntawm tus kheej, tab sis kev tiv thaiv ntawm xoom nkag mus rau ntau tshaj kev tiv thaiv hauv av, vim hais tias cov xoom kab cuam tshuam, luv luv Circuit Court tam sim no, yog li kov yeej qhov kev tiv thaiv grounding yuav tsum tau ntawm nws ua hauj yog cov kev txwv me me heev.
Thib tsib, kev tiv thaiv kev tiv thaiv thiab tiv thaiv qhov sib txawv ntawm qhov xoom
Lub ntsiab sib txawv ntawm kev tiv thaiv lub ntiaj teb thiab kev tiv thaiv yog:
(1) kev tiv thaiv kev tiv thaiv kev tiv thaiv sib txawv ntawm lub hauv paus yog txwv rau cov khoom siv tom qab lub ntiaj teb xau hluav taws xob, kom tsis txhob dhau qhov kev nyab xeeb. Hauv qhov siab-hluav taws xob, kev tiv thaiv kev tiv thaiv hauv av ntxiv rau kev txwv ntawm qhov voltage rau hauv av, qee qhov xwm txheej, tab sis kuj txhawb nqa qhov kev ua ntawm lub zog daim phiaj tiv thaiv ntaus; kev tiv thaiv yog txuas nrog xoom kab los ntawm cov cuab yeej siv los ua ib-ntu-luv luv ntu kev xaim hluav taws xob txhawm rau txhawm rau txhawb txoj kab Kev tiv thaiv cov khoom siv, nrog rau lub zog los txiav tawm cov txhaum ntaus. Tsis tas li ntawd, kev tiv thaiv xoom kab kev tiv thaiv, kev tiv thaiv ntawm xoom thiab rov ua hauv av kuj tuaj yeem npaj kom tsis txhob xau thaum lub hauv av voltage.
(2) Cov kev thov ntawm kev tiv thaiv sib txawv Kev sib tw av ob qho tib si rau cov dav hluav taws xob uas tsis muaj qhov siab thiab qis hluav taws xob daim phiaj, kuj tseem siv rau lwm yam kev nyab xeeb (xws li kev teeb tsa kev tiv thaiv qis) qis hluav taws xob hluav taws xob network; kev tiv thaiv tsuas yog siv rau nruab nrab xoom ncaj qha Cov hluav taws xob hluav taws xob tsawg daim phiaj.
(3) cov kab sib txawv yog tias cov cuab yeej tiv thaiv kev tiv thaiv zoo, daim phiaj kab hluav taws xob tuaj yeem yog xoom kab ua haujlwm, tsuas yog teeb tsa thaiv kev tiv thaiv; Yog tias kev tiv thaiv ntawm kev nkag mus rau xoom ntsuas, koj yuav tsum teeb tsa txoj haujlwm ntawm xoom, siv rau xoom rau xoom kab tiv thaiv ua haujlwm. Kev tiv thaiv yuav tsum tsis txhob txuas nrog cov xoom kab txuas, fuses, thaum ua haujlwm hauv xoom ntawm kev teeb tsa ntawm fuses thiab lwm yam khoom tawg, nws kuj yuav tsum tau txhim kho kom tiv thaiv xaim hauv av lossis kab xoom.
Thib rau, qhov twg ntawm cov khoom siv hluav taws xob yuav tsum tiv thaiv av lossis xoom
Qhov twg nyob rau hauv qhov xwm txheej tsis muaj hluav taws xob, thiab thaum lub rwb thaiv tsev puas, tsoo lub plhaub luv-Circuit lossis lwm yam tsis ua haujlwm, tej zaum yuav raug them cov khoom ntawm cov khoom hluav taws xob thiab nws cov khoom siv yuav tsum tau nkag hauv av lossis nkag mus rau xoom. Cov hlau qhov chaw lossis cov khoom siv hluav taws xob suav nrog:
(1) Lub thawv hlau lossis lub hauv paus rau lub cav, hloov pauv, Circuit Court breakers thiab lwm yam khoom siv hluav taws xob.
(2) qhov tshuaj ntsuam (phaj) thiab daim tswj hwm (Taiwan) thav duab, hloov pauv, faib cov ncej hlau thiab ze rau ntawm qhov chaw nyob ntawm cov hlau thaiv thiab lub qhov rooj hlau, tiv thaiv ua vaj tse khov kho.
(3) cov hlau hlau thiab kab thaiv kev tiv thaiv thiab cov tawv nqaij hlau, AC thiab DC lub zog hluav taws xob sib tshuam lub thawv thiab lub thawv lub thawv ntawm lub plhaub hlau, tsheb npav thaiv kev tiv thaiv thiab tiv thaiv network.
(4) cov tshuab hluav taws xob tua hluav taws xob, cov kiv cua hluav taws xob thiab cov khoom siv hluav taws xob, hlau puag thiab lub plhaub, cov kab khiav crane.
(5) cov kab tawm sab nraud thiab kab ntawm kab ntawm cov pej thuam hlau, thiab ntsia tau rau hauv tus pej thuam ntawm qhov hloov mus, lub ntsuas hluav taws xob thiab lwm lub plhaub thiab cov ntawv sib txuas.
(6) qhov tam sim no transformer thiab voltage transformer theem nrab winding.
(7) Kev siv lub tshuab hluav taws xob nqa tau hluav taws xob lossis cov khoom siv hluav taws xob uas tsis siv lub tshuab hluav taws xob cais, uas tshaj qhov ntsuas hluav taws xob zoo.
(8) cov khoom siv hluav taws xob, kev xa khoom.
(9) tus neeg ntes, kev tiv thaiv qhov sib txawv, lub pas nrig xob laim thiab txuas tus lej capacitor.
7, qhov twg ntawm cov khoom siv hluav taws xob, cov khoom siv hlau tsis tuaj yeem tiv thaiv av lossis xoom
Cov hlau hauv qab no ntawm cov khoom siv hluav taws xob, tshwj tsis yog muaj lwm qhov sau, feem ntau tsis tiv thaiv hauv av lossis nkag mus rau xoom:
(1) qhov kev nyab xeeb ntawm qhov chaw qhuav lossis qis dua qhov hluav taws xob muaj kev nyab xeeb (AC 50 volts lossis tsawg dua, 110 volts DC) hluav taws xob khoom siv plhaub.
(2) Cov ntaub ntawv thaiv rau cov ntsuas hluav taws xob, cov xa tawm thiab lwm yam khoom siv hluav taws xob qis hluav taws xob tau teeb tsa ntawm lub vaj huam sib luag (tshuaj ntsuam), kev tswj hwm (s) thiab cov kab hluav taws xob faib ncej.
(3) cov kab ua haujlwm tshaj sab saum ntoo thiab hloov cov ntoo sab nraum zoov ntoo ntawm lub qhov ntxig ntxig hlau ua haujlwm, thiab rwb thaiv kev puas tsuaj yuav tsis muaj kev phom sij rau lub rwb thaiv tsev hlau.
(4) Kev txhawb nqa rau hauv av rau cov tshuab hluav taws xob thiab cov nplov hluav taws rau ntawm cov hlau txuas, kab hlau tshuab thiab hluav taws xob thaiv hluav taws xob rau ntawm cov tshuab.
(5) qhov chaw tsis muaj hluav taws xob ntawm cov khoom siv hluav taws xob tsawg (nrog rau kev sib txuas nrog cov khoom siv hlau, thiab lwm yam) plhaub.
(6) nruab nrog qhov siab siab kom ntseeg tau tus kheej kev nyab xeeb hluav taws xob tiv thaiv hluav taws xob tiv thaiv.
8, los tiv thaiv cov xim ntawm cov av hlau
Tuam Tshoj' s yav dhau los cov khoom siv hluav taws xob, cov av hlau yog cim nrog dub, cov paib no tau raug tshem tawm. Tam sim no, Tuam Tshoj tau ua raws li cov txheej txheem thoob ntiaj teb, kev siv cov xim daj, ntsuab xim insulated hlau ua ib txoj hauv kev tiv thaiv hlau. Cov xim daj thiab xim daj yog International Electrotechnical Commission los tiv thaiv cov kab hauv av rau cov qauv xim tshwj xeeb, tau txais thoob ntiaj teb, peb lub teb chaws tseem nyob rau hauv cov qauv coj tau qhia meej txog kev siv cov qauv no xim. Txawm li cas los xij, Nyiv, Western Europe, ntau lub teb chaws siv cov kab ib txoj kab ntsuab raws li kev tiv thaiv ntawm cov av hlau, yog li qee qhov peb xa tawm ntawm cov khoom hluav taws xob hauv cov teb chaws no kuj siv cov kab ntsuab ib qho kev tiv thaiv hauv av. Yog tias koj siv qhov kev xa tawm no mus rau cov khoom hluav taws xob hauv tsev, peb yuav tsum them sai sai, tsis txhob coj cov xim tsis zoo ntawm cov hlau txuas txuas rau cov kab tsis yog, uas ua rau lub zog hluav taws xob. Yog tias cov txheej txheem tiv thaiv hluav taws xob hauv av hlau tsis yooj yim rau kev txiav txim siab, koj yuav tsum saib cov lus qhia, lossis qhib kev qhia kom paub, lossis txiav txim siab nrog multimeter.
Cuaj, nyob rau hauv qhov chaw faib khoom hluav taws xob tsawg, kev siv cov kev tiv thaiv kev tiv thaiv xoom yuav tsum xyuam xim rau cov teeb meem
Hauv 1 kV fais fab faib cov kab ke, kev siv kev tiv thaiv kev tiv thaiv xoom yuav tsum nco ntsoov cov hauv qab no:
(1) peb-theem plaub-xaim hluav taws xob qis hluav taws xob tsis txaus hluav taws xob nruab nrab taw tes yuav tsum muaj av zoo, ua haujlwm tiv thaiv kev ua haujlwm yuav tsum ua tau raws li qhov yuav tsum ua kom txoj kab xoom los ntawm kev ua haujlwm thiab tiv thaiv ntawm lub luag hauj lwm dual.
(2) yuav tsum nyob rau hauv qhov chaw los mus rov ua qhov av xoom kom tiv thaiv xoom kab ua rau muaj kev phom sij.
(3) xoom xaim lub voj hluav taws xob yuav tsum tsis txhob nruab nrog cov pob nyem thiab fuses kom tiv thaiv lub xoom kab kev cuam tshuam thaum cov khoom siv xoom kom tsim hluav taws xob hauv av txaus ntshai; tab sis tsis yog rau kev tiv thaiv ntawm txoj kab xoom, lossis lwm qhov kev tiv thaiv txuas nrog xoom kab, tuaj yeem ua rau hauv Circuit Court theem thiab xoom kab hloov thiab fuse.
(4) ntawm xoom cov kab yuav tsum tau ua thiab tib theem kab los tiv thaiv lub xoom txoj kab kev tsis ua haujlwm.
(5) kev tiv thaiv ntawm tag nrho cov khoom siv hluav taws xob, tom qab ntawd lub xoom kab yuav tsum tau txuas nrog rau qhov khiav ntawm xoom.
(6) nyob rau hauv txoj kev nkag mus tsis pub ib qho cuab yeej siv los ua qhov thaiv kev tiv thaiv av.
(7) xoom txoj kab ntawm kev nqa khoom tam sim no yuav tsum muaj ntau tshaj qhov theem tam sim no nqa tau qhov tsawg kawg yog 1/2.
(8) qhov tsawg kawg nkaus ntu ntawm ntu ntawm txoj kab xoom yuav tsum tsis pub tsawg tshaj qhov qis tshaj kev sib cais uas tau teev tseg hauv kev txiav txim kom paub tseeb tias txoj kab xoom tuaj yeem tiv thaiv luv luv Circuit Court tam sim no thiab tshem tawm cov khoom siv yuam kev tsis raug.
10, tsis siv neeg txiav tawm cov hauv paus ntsiab lus ntawm kev muab fais fab
Tsis siv neeg txiav tawm lub zog ntawm kev tiv thaiv kev tiv thaiv, hais txog kev siv cov khoom hloov uas tsim nyog, thaum cov cuab yeej rwb thaiv tsev puas tsuaj, nyob rau ib lub sijhawm tshwj xeeb txiav tawm lub hwj chim ua kom puas cov khoom siv los tiv thaiv kev txaus ntshai ntawm kev cuam tshuam rau tib neeg raug hluav taws xob. poob siab los ntawm dhau lawm ntev. Yog li no, lub hauv paus ntsiab lus yog: txhua qhov tsis ua tiav ntawm cov khoom siv hluav taws xob tsim los ntawm qhov txhaum tam sim no, kom ntseeg tau tias tus kheej muaj kev nyab xeeb hauv lub sijhawm yuav tsum tau txiav tawm hauv lub sijhawm.
Qhov kev tiv thaiv kev tiv thaiv no tau muab teev cia rau hauv qab ob qhov kev cuam tshuam no:
(1) qhov kev ntws tawm tam sim no, lossis" txhaum lub voj" ;, qhov txhaum ntawd lub zog ntws hauv lub voj. Cov sib xyaw ua ke ntawm lub voj, thiab cov faib hom (lossis nruab nrab ntu system). Feem ntau, kev siv TN, TT, IT ntau qhov sib txawv tshuab txhaum voj yog qhov sib txawv.
(2) txiav lub txhaum tam sim no lub sijhawm, uas yog, kev txhaum tshwm sim, nyob rau hauv ib lub sijhawm txiav tawm qhov txhaum tam sim no los tiv thaiv tus kheej kev nyab xeeb. Lub sijhawm los txiav tawm kev txhaum tam sim no yog lub luag haujlwm ntawm ntau yam. Piv txwv li, qhov tshwm sim ntawm qhov tsis ua haujlwm tshwm sim, qhov tsis ua tiav ntawm tib neeg lub cev tau kov qhov tshwm sim ntawm lub plhaub ntaus ntawv. Tab sis tus yuam sij yog tib neeg lub cev kov lub plhaub them, qhov loj me ntawm qhov sib chwv voltage yuav raug kev txom nyem
11, raws li cov kev cai ntawm IEC txheej txheem ua haujlwm txheej txheem ntawm cov taw tes nruab nrab
Raws li IEC tus qauv, cov tshuab hluav taws xob muaj hluav taws xob tsawg, muaj peb ntu nruab nrab ntawm kev ua haujlwm:
(1) Qhov nruab nrab ntawm taw tes ntawm TN system lub zog muab hluav taws xob tau ncaj qha rau hauv av, thiab qhov kis tau ntawm qhov ua tau zoo (cov ntaub ntawv hlau) ntawm cov khoom thauj tau txuas nrog qhov chaw kis tau los ntawm tus tiv thaiv tiv thaiv. TN system tau muab faib ua peb hom: TN-S system, hauv tag nrho cov txheej txheem, tus neeg tswj xyuas qhov nruab nrab thiab tus tiv thaiv tiv thaiv yog cais nruj ntawm tus neeg xyuas pib, uas yog, thiaj li hu ua ib-theem peb-hlau thiab peb-theem tsib. -wire system; TN-CS system, lub kaw lus muaj ib feem ntawm tus neeg xyuas pib thiab kev tiv thaiv ntawm tus neeg xyuas pib ua haujlwm nyob rau hauv tus neeg xyuas pib, lwm qhov ntawm cov neeg nruab nrab tsis mloog thiab tiv thaiv lub cev yog TN-C system, hauv tag nrho qhov system, tus neeg xyuas pib nruab nrab thiab kev tiv thaiv ntawm tus neeg xyuas pib ua haujlwm ua ke hauv tus neeg xyuas pib, uas yog, feem ntau siv hauv Suav teb nkag mus rau hauv xoom thaiv kev tiv thaiv.
Qhov thib ob ntawv" N" qhia tau hais tias qhov raug tshem tawm ib feem ntawm lub cuab yeej txuas ncaj qha mus rau hauv av ntawm lub zog fais fab. Qhov thib ob ntawv" N" qhia tias lub zog hluav taws xob txuas ncaj qha rau kis (lossis nruab nrab nruab nrab) Daim ntawv" S" qhia tau hais tias tus neeg tswj xyuas tsis nyob nruab nrab thiab tus coj tiv thaiv sib cais; tsab ntawv" C" qhia tau hais tias tus neeg xyuas pib nruab nrab thiab tus coj tus cwj pwm tiv thaiv ua ke ntawm ib qho tus neeg xyuas pib.
(2) TT system lub zog hluav taws xob muaj qhov taw tes ncaj qha rau hauv av, cov cuab yeej siv hluav taws xob tiv thaiv ib feem ntawm qhov chaw tswj hluav taws xob thiab lub zog hluav taws xob hauv av tsis muaj feem xyuam nrog hluav taws xob, Tuam Tshoj hu ua kev tiv thaiv av.
Thawj ntawv" T" qhia tau hais tias qhov taw tes hauv lub zog fais fab yog ncaj qha rau hauv av; tsab ntawv ob" T" qhia tau hais tias qhov hluav taws xob hauv av ntawm qhov raug tshem tawm ib feem ntawm cov cuab yeej tsis raug xaiv sib txuas nrog rau hauv av ntawm qhov hluav taws xob.
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