题目内容

凸缘联轴器具有补偿位移和减振缓冲作用。

A. 对
B. 错

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联轴器可以在运转过程中结合和分离。

A. 对
B. 错

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[音频]Listen to the short telephone conversations and write down the messages in the blanks.Message: Call Judy (1)_ the Art Museum at (2)_ tomorrow morning.