题目内容

杆长之和条件是指:铰链四杆机构中最短杆与最常杆长度之和( )其他两杆长度之和。

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在杆长不等的铰链四杆机构中,若L1=L2=L3

The home address was incomplete, so the letter could not be _______________.

His father was finally ____________ after he was proven to be innocent(无辜的),but he had already spent ten years in prison.

Did he give you ______________________ to use his computer?

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