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【单选题】
铰链四杆机构的压力角是指在不计摩擦情况下主动件通过连杆作用于( )上的力与该力作用点速度间所夹锐角A.
主动件
B.
连架杆
C.
从动件
D.
机架
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【简答题】Part IV Add the prefix “-ful” to the words in the box. Then complete the sentences below with the words formed. color help hope pain cheer 1. She sobbed (啜泣) as she...
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