金属电缆桥架及其支架和引入或引出的金属电缆导管,必须接地(PE)或接零 (PEN)可靠,且必须符合 ( )规定。
A、金属电缆桥架及其支架全长应不少于两处与接地(PE)或接零(PEN)干线相连接AC
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Inthe1960spopmusicunderwentarevolutionwhen________becameworldfamousandturnedtheirhometownofLiverpoolintoaplaceofpilgrimage.
TheaveragelifeexpectancyoftheRedIndiansis________.
ThethreePuritantraditionsare________.
英语翻译:振兴中华
TheoriginoftheAmericanpartysystemcanbetracedto________.