避雷器按其标称放电电流20kA的配电用避雷器额定电压有效值为（）_爱下问搜题

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问题单项选择题

避雷器按其标称放电电流20kA的配电用避雷器额定电压有效值为（）kV。

A.420≤Ur≤468

B.90≤Ur≤468

C.50≤Ur≤108

D.60≤Ur≤207

答案

参考答案：A

选择题

—Why didn't you take her to the mall?

—She always likes spending _ __ money. [ ]

A. too much

B. too many

C. much too

D. many too

判断题

凡是涉及应税行为的均为纳税人。