单项选择题

PLC的基本单元主要( )部分构成。 A.
微处理器(CPU)、存储器 B.
输入和输出模块、电源模块 C.
I/O扩展接口、外设I/O接口 D.
以上都是

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My watch is five minutes fast.

答案：正确答案：我的表快了五分钟。

单项选择题

Which of the following choices is NOT true about the ancient Olympics? A.
People would stop the battle in progress. B.
People would return home safely after the games. C.
Women were not allowed to participate. D.
Athletes wore nothing during the competition.