试题与答案

下面的生活事例与运用的物理知识的说法,错误的是( ) A.用力拍桌子,手感到疼,

题型:选择题

题目:

下面的生活事例与运用的物理知识的说法,错误的是(  )

A.用力拍桌子,手感到疼,是因为物体间力的作用是相互的

B.下雪天,马路上撒沙子是使接触面变得粗糙来增大摩擦力

C.瓶盖起子是利用杠杆的动力臂大于阻力臂来省力

D.轮船漂浮在水面上是利用船所受的浮力大于重力的道理

答案:

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