消弧线圈采用欠补偿运行时，当网络发生故障或因其它原因使某些线

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问题单项选择题

消弧线圈采用欠补偿运行时，当网络发生故障或因其它原因使某些线路断开后，可能（）。

A．构成串联谐振，产生过电压

B．使中性点位移，电压达最高值

C．影响消弧效果

答案

参考答案：B

补全对话，情景问答

根据对话内容，补全对话，使其完整﹑通顺。每空一词。

A: we have many rules at school.

B: (1) do we. For example, we have to (2) school uniforms every school day.

A: We usually do, too. We are not allowed to play soccer at school because we don't have a soccer field.

B: Oh, we are lukier than you. We have a big soccer field but we can only (3) it in P.E.

A: Our teachers are very (4) to us but sometimes they are strict. I think it's good for us.

B: I (5) with you. I'll miss them when I graduate.

多项选择题

只能减轻系统失调，不能解决系统下部散热器超压问题的热水采暖系统形式是( )。

A．热水和蒸汽混合式系统

B．单双管混合式系统

C．双线式采暖系统

D．分区式系统