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單項選擇題

換向箱第四軸的差速器其固定螺栓擰緊力矩為（），同時防松墊片必須折彎包住螺栓頭

A.180～200N˙m
B．220～250N˙m
C．200～230N˙m
D．250～280N˙m

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單項選擇題

I recently went to a charity party. At the end of the visit our host told us that the following Monday was his birthday. He asked21, as a gift to him, we would do something kind for someone else on th

A、that
B、how
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D、what