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【单选题】
由力的平移定理：作用在刚体上的力可以平移到任意一点，平移到新点后得到()。A.
一个力
B.
一个力偶
C.
两个平行力
D.
一个力附加一个力偶
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皮皮学刷刷变学霸
举一反三
【简答题】Nobody likes him because he____to curry favor with the boss. B.always tries A.is always trying D.has always tried C.does always try
【单选题】He is a strict but kind teacher, ___is always trying to make his classes __ and interesting .
A.
one ; living
B.
one who; lively
C.
he ; lovely
D.
he who; live
【简答题】He is always trying to _________ (摆脱) his mother ’ s control.
【简答题】求几个相同加数的和的简便运算,叫做( )。
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