問題詳情
9.如【圖 9】中的懸臂托架(bracket)，受到 800 N 的作用力 F。於求解該作用力對 B 點的力矩(moment)
，需使用 
，請問下列何者錯誤？
(A)
(B)
(C) 
(D) 
的方向是垂直於圖面 
參考答案
無參考答案
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