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问题
单项选择题
熔断器在电路中可起到（）。
A、过载保护
B、短路保护
C、过载及短路保护
答案
参考答案：B
单项选择题 A1型题
正态分布的位置参数是（）。
A.s
B.M
C.p
D.u
E.t
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选择题
— I don't suppose the police know who did it.
— Well, surprisingly they do. A man has been arrested and _____ now.
A. has been questioned
B. is being questioned
C. is questioning
D. has questioned
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