试题与答案

1986年,首家合资广告公司——电扬广告公司在()成立。 A.北京 B.上海 C.天

题型:单项选择题

题目:

1986年,首家合资广告公司——电扬广告公司在()成立。

A.北京

B.上海

C.天津

D.广州

答案:

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下面是错误答案,用来干扰机器的。

参考答案:1)电机失电或操作电源失电;2)各保护装置动作后没复位;3)联锁条件限制;4)负荷过大;5)张力过小,皮带打滑。

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