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【单选题】
杆AB和CD的自重不计,且C处光滑接触,若作用在AB杆上的力偶矩为M1,则欲使系统保持平衡,作用在CD杆上的力偶矩M2的转向如图所示,其矩值为
A.
M2=M1
B.
M2=4M1/3
C.
M2=2M1
D.
M2=M1/2
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