問題詳情
22.下列生活中的一些現象:(甲)穿溜冰鞋在冰上溜冰；運動鞋的底部有許多紋路；(丙)賽跑選手穿釘鞋；(丁)車子的輪胎上都有一些花紋；(戊)機械要常加潤滑油；(己)車子輪胎的形狀是圓形的。請問其目的是要減少摩擦力的有幾種?
(A)2
(B)3
(C)4
(D)5
(A)2
(B)3
(C)4
(D)5
參考答案
無參考答案
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