题目内容

The man often makes purchases from the company.

A. 对
B. 错

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The woman think the company was acting against the law.

A. 对
B. 错

所谓卸荷,就是指泵的功率损耗接近于( )的运转状态。

卸荷方法有( )卸荷和( )卸荷两种。

背压回路以形成一定的回路阻力,用以产生背压,一般背压为( )MPa。

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