[名词解释] 额定电压(rated voltage)
[名词解释] 故障电压(fault voltage)
[名词解释] 接触电压限值(touch voltage limit)
[名词解释] 特低电压(extra-low-voltage或ELV)
[问答题] 什么是电池的标称电压?
[单选题]220V单相供电电压为标称电压的()。A.+7%,-10%B.±7%C.±10%D.±5
[单选题]()的英语是voltage。A . 电压B . 电阻C . 电流D . 电器
[单选题]When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is _____.A.laggingB.leadingC.maximumD.minimum
[名词解释] 英译汉:voltage