试题与答案

以下关于机器的说法中,错误的是()。 A.常用的动力机有电动机和内燃机 B.机器的传

题型:单项选择题

题目:

以下关于机器的说法中,错误的是()。

A.常用的动力机有电动机和内燃机

B.机器的传动部分是将原动机提供的机械能以动力的形式传递给工作部分

C.工作部分是机器设备区分和分类的依据

D.机器能够实现能量的转换或代替人的劳动去做有用的机械功,而机构没有这样的功能

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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从方框中选择恰当的句子补全对话。

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A: Yes. 2._____

B: How did it happen?

A: Two students were playing football on their way home. 3._____

B: What did the driver do with them?

A: The driver took them to the hospital and 4. _____ 

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E. A car hit them and they were badly hurt.

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