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通用交流电源的PLC,可以对外提供一组DC24V的电源。( )

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交流接触器的作用是（）。

A. 频繁通断主回路
B. 频繁通断控制电路
C. 保护主回路
D. 保护控制回路

原文:不坚持社会主义,不改革开放,不发展经济,不改善人民生活,只能是死路一条。译文: we did not adhere to socialism, implement the policies of reform and opening to the outside world, develop the economy and raise living standards, would find ourselves in a blind alley.

A. If, we
B. When, they
C. While, they
D. If, they

原文:心理学家说,只有同时兼备娱乐休闲时间和心满意足的工作,我们才会感到幸福。我的曾祖母养育了14个子女,以洗衣为生,我不相信她能有多少闲暇,她对工作感到多么满意. 译文:Psychologists tell us that to be happy we need a blend of enjoyable leisure time and satisfying work. I doubt that my great-grandmother, who raised 14 children and took in washing, had much of ____.

A. all
B. either
C. neither
D. Both

Inanimate subject and animate verb are frequently used in English.( )