题目内容

Following are five reactions to a fender-bender accident (in which one car hits and slightly damages the rear fender of another car).Match the reaction in the first group with the right tone in the second group.

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How to charge a cell phone.1. First ( turn on / turn off ) the power.2. Then ( unplug / plug in ) the phone.3. After it’s charged, ( plug in / unplug ) the phone.4. When you’re finished, ( turn on / turn off ) the power.

刚体的转动惯量的大小与以下哪个物理量无关

A. 刚体的密度
B. 刚体的几何形状
C. 刚体转动的角速度
D. 转轴的位置

转动惯量为25kg · m2 、半径为0.5m的定滑轮绕中心轴转动,其边缘受到10N的切向摩擦阻力,阻力矩的大小为N · m,其角加速度的大小为rad/s−2

以下关于唇癌的描述哪项是错误的()

A. 唇癌主要是鳞癌
B. 唇癌多发于下唇
C. 唇癌较其它口腔癌易发生淋巴结转移
D. 唇癌在西方人(或白种人)中的发病率较东方人(或黄种人)高
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