[問題] 理化問題
請問木筷是混合物還是有機化合物?
下列摩擦力何者正確?(我覺得C.D有問題)
C:物體靜止時沒摩擦力
D:最大靜磨擦力和動磨擦力皆和作用力成正比
答案給D 我覺得是C
請問是C還是D?
明天就要考了 請大家幫個忙 謝謝
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