Science
Junior High
Resolved
想問這題是怎麼看的
40
國中自然 5
月
包裹
如右圖,欲施力將一圓柱推上階梯,以哪一種方式推動,
所需之力最小?
(A) F₁
(B)F2
(C) F3
(D) F4
Fz
F
E
Answers
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