【单选题】
保护接地指的是电网的中性点不接地设备外壳( )。
A. 不接地
B. 接地
C. 接零
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答案
B
解析
暂无解析
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【单选题】
按钮联锁正反转控制线路的优点是操作方便，缺点是容易产生电源两相短路事故。在实际工作中，经常采用( )正反转控制线路。
A. 按钮联锁
B. 接触器联锁
C. 按钮、接触器联锁
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