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【多选题】
静摩擦因数与下列哪些因素有关( )A.
接触物体的材料
B.
接触处的粗糙程度
C.
接触处的温度、湿度、润滑情况
D.
接触物体间的正压力
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【简答题】George Gershwin ,born in 1898,was one of America’s greatest composers.He published his first song when he was eigh years old. During the next twenty years he wrote more than five hundred songs . M...
【简答题】George Gershwin, born in 1998, was one of America’s greatest composers. He published his first song when the was eigh years old. During the next twenty years he wrote more than five hundred songs....
【简答题】dizzy a.
【简答题】Gershwin was born in_________ (Year)
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