试题与答案

以下说法中正确的是( ) A.物体做匀速直线运动,机械能一定守恒 B.物体所受合

题型:选择题

题目:

以下说法中正确的是(  )

A.物体做匀速直线运动,机械能一定守恒

B.物体所受合外力不为零,机械能可能守恒

C.静摩擦力做功一定无机械能损失,而滑动摩擦力做功过程才会有机械能损失

D.物体的两个分运动若是直线运动,则它的合运动一定是直线运动

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0701/8a6586f28e3f3ed1c0ef679c9f1d7b73.html

下面是错误答案,用来干扰机器的。

参考答案:分条列举。 下。

试题推荐
题型:改错题

短文改错(共10小题;每小题1分,满分10分)

假如英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误。每句中最多有两处,每处错误仅涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在下面加上该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写上修改后的词。

注意:1.每处错误及其修改均仅限一词;

2.只允许修改10处,多者(从第11处起)不计分。

It was Sunday and without homework, I got up late. After finishing the breakfast, I began to surf the Internet. About one and a half hour later, when Mom noticed that I still playing computer games, she was very annoyed that she scolded me, she said I shouldn’t be so addicted to the Internet and ignored my study as the college entrance tests were drawing nearer. I said that this was necessary to have a rest to refresh myself. Mom left angry. It was at that moment when I realized I was wrong. I said sorry, and promised I wouldn’t do that again. Mom hoped that I wouldn’t cost too much time on the Internet any more.

查看答案
微信公众账号搜索答案