2. 試求 B 的受力？ 
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(A)Bx = 160 N → , By = 150 N ↑
(B) Bx = 180 N → , By = 170 N ↑
(C) Bx = 200 N → , By = 190 N ↑
(D) Bx = 220 N → , By = 210 N ↑

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統計： 尚無統計資料