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问题 单项选择题

云量记录中10/7指（）

A.总云量为7，低云量为10

B.总云量为10，低云量为10

C.总云量为7，低云量为总云量的7/10

D.总云量为10，低云量为7

答案

参考答案：D

选择题

The ancient village, ______ they visited during a recent trip, is the only tourist attraction ______ is well protected without any damage.

A．which, which

B．which, that

C．where, that

D．that, which
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单项选择题

已知某一电力网络及其参数如题4-29图所示，节点①送出的功率S1为（）MVA。

A．12.84+j6.64

B．13.92+j7.43

C．12.097+j6.192

D．13.124+j6.563
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