問題詳情
5. 一艘小船在海上張著帆。由於沒有風，小船不動。一個水手突然想出一個主意可令小船運動：在船上放一個電風扇對著帆，就會有風使得小船運動。假設電風扇開動了，小船將會：
(A)向前運動
(B)向後運動
(C)完全不動
(D)只當將帆降下後才向前運動
(A)向前運動
(B)向後運動
(C)完全不動
(D)只當將帆降下後才向前運動
參考答案
答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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