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【多选题】
一刚体只有两力 F A 、 F B 作用,且 F A + F B = 0(即两力大小相等方向相反,但不一定共线) ,则此刚体( ); 一刚体上只有两力偶 M A 、 M B 作用, M A + M B = 0 ,则此刚体( )。A.
一定平衡;
B.
一定不平衡;
C.
平衡与否不能判定。
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举一反三
【单选题】境内旅游,旅行社在出发前2日通知旅游者中止旅游的,应向旅游者全额退还预付旅游费用,并支付旅游费用总额()的违约金。
A.
10%
B.
15%
C.
20%
D.
25%
【单选题】They failed to pass the exam last time. I regretted ______them. A. to be not able to help B. being not able to help C. not being able to help D. not be ...
A.
to be not able to help
B.
being not able to help
C.
not being able to help
D.
not be able to help
【简答题】A．Being initiative. B．Being able to lead a team. C．Being dynamic. D．Being able to prettily use power.
【单选题】She apologized for _____ the party.
A.
not her being able to attend
B.
her not being able to attend
C.
her being able not to attend
D.
her being notable to attend
【单选题】She apologized for ______.
A.
her not being able to attend the meeting
B.
her being not able to attend evening party
C.
her being able not to attend the class
D.
not her being able to attend the lecture
【单选题】境内旅游,因旅行社原因未成行,在出发前2日通知旅游者,应向旅游者全额退还预付旅游费用,并支付旅游费用总额( )的违约金。
A.
10%
B.
15%
C.
20%
D.
25%
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