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【单选题】
图示作用于三角架的杆 AB 中点处的铅垂力 如果沿其作用线移动到杆 BC 的中点,那么 A 、 C 处支座的约束力的方向 。A.
与F的方向相反
B.
不能确定
C.
不改变
D.
改变
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