問題詳情
7. 如圖所示為一同平面平行力系，其合力之作用位置到A點之距離為多少m？ 
(A)0.
(B)2.
(C)5.
(D)9.m。
(A)0.
(B)2.
(C)5.
(D)9.m。
參考答案
答案：A
難度：適中0.416667
統計：A(10),B(6),C(1),D(2),E(0)
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