试题与答案

照明线路的零线,除规定的情况外,是不允许安装()的。

题型:填空题

题目:

照明线路的零线,除规定的情况外,是不允许安装()的。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析: (1715+775)÷5827×100%≈42.7%,故选C。

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