UPS的交流输入和输出线路应采用三相五线制供电方式,保护地线线径不得小于()。
A、16mm2
B、35mm2
C、50mm2
参考答案:B
________ by the heavy snowfalls, Chenzhou, a city in South China, was cut off from the outside,
________ water and electricity shortage.[ ]
A. Having struck; facing
B. Having struck; faced
C. Struck; facing
D. Struck; faced
抚顺:煤都
A.九江:瓷都
B.宜兴:陶都
C.南充:锡都
D.桂林:锦都