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问题 单项选择题

通用示波器不可测量高于允许（）的电压或电流

A、输入值

B、输出值

C、最小值

D、最大值

答案

参考答案：A

选择题

下列计算正确的是（　　）

A．a2+a2=a4

B．a5•a2=a7

C．（a2）3=a5

D．2a2-a2=2
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选择题
—Why didn't you go shopping with them?
—Because my son is so young that he can't dress ______.

A. him
B. him clothes
C. himself
D. his
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