单项选择题

若要放置电源符号，应如何操作？

A.按钮
B.按钮
C.按钮
D.按钮

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单项选择题

Which is considered one of the greatest films winning 10 Academy Awards?
A、Gone With The Wind.
B、Grand Hotel.
C、A Streetcar Named Desire.
D、Citizen Kane.

无限阶循环群G中只有个不同的生成元。

答案： (1)
2