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【单选题】
以下四种说法，正确的是A.
力偶对某点之矩的值与该点的位置无关
B.
之矩的值与矩心的位置无关
C.
力偶对物体的作用可以用一个等效替换
D.
特殊条件下，一个力偶可以与一个力互相平衡
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A.
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B.
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C.
人际关系具有间接性、可测量性等特点
D.
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A.
turned on
B.
turned off
C.
turned up
D.
turned down
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A.
energize
B.
freeze
C.
install
D.
thrash
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