题目内容

活塞发动机进行混合气燃烧的地方是活塞

A. 对
B. 错

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推杆的作用是推动活塞做功

A. 对
B. 错

气缸、活塞合在一起被称为曲拐机构

A. 对
B. 错

I’ve been wearing glasses since I was a high school student.

I am very near-sighted and wearing a pair of contact lens now.