题目内容

当电压、电流采用关联方向时，P大于零，则该段电路提供功率。()

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由标准容器出来的数字流加上通道开销后就构成了虚容器。()

三相四线制电路无论对称与否，都可以用三瓦计法测量三相总有功功率。()

The findings of the two archaeologists threw light on the burial customs of the ancient Egyptians.

A. paid attention to
B. gave faith to
C. laid emphasis on
D. gave insight into

A.happierB.more surprisedC.happyD.surprised

A. happier
B. more surprised
C. happy
D. surprised