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【单选题】
关于力矩有以下几种说法,其中正确的是 ( ) (A)内力矩会改变刚体对某个定轴的角动量(动量矩); (B)作用力和反作用力对同一轴的力矩之和必为零; (C)角速度的方向一定与外力矩的方向相同; (D)质量相等、形状和大小不同的两个刚体,在相同力矩的作用下,它们的角加速度一定相等。A.
B.
C.
D.
D
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皮皮学刷刷变学霸
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【单选题】—Dad, when will you be free? You agreed to go to the seaside with me four days ago. —I'm sorry, Jack. But I think I will have a _______ holiday soon. [ ]
A.
four-days
B.
four-day
C.
four days
D.
four day
【单选题】Will you be free to ______ tomorrow afternoon, Mrs. Darcy?
A.
come to
B.
come across
C.
come over
D.
go here
【单选题】Will you be free to ______ tomorrow afternoon,Mrs.Darcy?
A.
come to
B.
come across
C.
come over
D.
go there
【单选题】—Dad, when will you be free? You agreed to go to the seaside with me fourdays ago. —I'm sorry, Jean. But I think I will have a holiday soon. [ ]
A.
four-days
B.
four-day
C.
four days
D.
four day's
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