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【多选题】
图中各物块自重及摩擦均不计,物块受力偶作用,其力偶矩的大小皆为 M ,图。则关于 A 、 B 两点约束力的大小和方向说法中正确的是 ( ).
A.
FA 和 FB 必等值、反向、共线。
B.
FA 和 FB 的大小不为 0 。
C.
力偶必须由力偶平衡，故 FA 和 FB 必等值、反向形成力偶矩不为 0 的力偶。
D.
FA 和 FB 一定皆为 0 ，不存在方向的问题。
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举一反三
【单选题】It is NOT mentioned but implied (暗示) that______.
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some kinds of electronic equipment are bad for our personal lives
B.
watching too much TV hurts children's eyes
C.
some kinds of electronic equipment cause social problems
D.
television has bad effects on both grown-ups and children
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【判断题】____应变式传感器一般是由 电阻应变片和测量电路两部分组成。
A.
正确
B.
错误
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【单选题】Some kinds of animals can change their colour with _______.
A.
conditions
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environment
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surroundings
D.
situation
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【单选题】痛经的主要症状是
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下腹疼痛
B.
腰酸
C.
月经量异常
D.
恶心
E.
头痛、头晕
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【单选题】People _________ some kinds of medicine should not give blood.
A.
getting
B.
having
C.
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D.
taking
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【单选题】痛经的主要症状是
A.
下腹痛
B.
腰酸
C.
月经量异常
D.
头痛头晕
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【单选题】There are ___ kinds of reference books in the library.
A.
other some
B.
some other
C.
some others
D.
others some
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【简答题】应变式传感器一般是由( )和 ( ) 两大部分组成。
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【单选题】What did the factory produce?
A.
Some kinds of televisions.
B.
Some parts of television.
C.
Several kinds of expensive arms.
D.
Several kinds of machines.
查看完整题目与答案
【单选题】It is not mentioned but implied (暗示) that________.
A.
some kinds of electronic equipment are bad for our personal lives
B.
watching too much TV hurts children's eyes
C.
some kinds of electronic equipment cause social problems
D.
television has had effects on both grown-ups and children
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【判断题】____应变式传感器一般是由 电阻应变片和测量电路两部分组成。
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【单选题】痛经的主要症状是
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【单选题】There are ___ kinds of reference books in the library.
A.
other some
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some other
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查看完整题目与答案
【简答题】应变式传感器一般是由( )和 ( ) 两大部分组成。
查看完整题目与答案
【单选题】What did the factory produce?
A.
Some kinds of televisions.
B.
Some parts of television.
C.
Several kinds of expensive arms.
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Several kinds of machines.
查看完整题目与答案
【单选题】It is not mentioned but implied (暗示) that________.
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some kinds of electronic equipment are bad for our personal lives
B.
watching too much TV hurts children's eyes
C.
some kinds of electronic equipment cause social problems
D.
television has had effects on both grown-ups and children
查看完整题目与答案