問題詳情
13. 如圖，若施力 F 推重量 W 的木塊，木塊仍靜止，則地面施給物體之支撐力N為 
(A) W
(B) W－
(C) W＋
F
(D)W+F (Ｅ) W+
。
(A) W
(B) W－
(C) W＋
F (D)W+F (Ｅ) W+
。
參考答案
答案：E
難度：非常困難0
統計：A(0),B(0),C(0),D(1),E(0)
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