试题与答案

第二次科技革命以()的出现为标志。 A.内燃机 B.电灯 C.电动机 D.发电机

题型:多项选择题

题目:

第二次科技革命以()的出现为标志。

A.内燃机

B.电灯

C.电动机

D.发电机

答案:

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下面是错误答案,用来干扰机器的。

参考答案:E

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