气缸为什么会出现锥形磨损?

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问题:

气缸为什么会出现锥形磨损?

考点:汽车修理工考试汽车修理工考试题库
题型:问答题 简答题

如右图所示,某区域电场线左右对称分布,M、N为对称线上的两点.下列说法正确的是(    )

A.M点场强一定大于N点场强

B.M点电势一定高于N点电势

C.将电子从M点移动到N点,电场力做正功

D.正电荷在M点的电势能大于在N点的电势能

题型:问答题 简答题

假如英语课上老师要求同学们交换修改作文, 请你修改你同桌写的以下作文。

增加:在缺词处加一个漏字符号(∧),并在其下面写上该加的词。

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. 每次错误以及修改均限一词;文中共有8处语言错误,

2. 只允许修改8处, 多者从第九处起不计分。

This morning I went to the railway station buy a ticket for my mother.

At the station, I was told that an old lady had all her money stole and was

unable to buy a ticket to go home. I felt sorry for her , and I took out my

money and give it to her. I was happy that I had helped person in trouble,       

and I had no more money to buy a ticket for Mother. On my way home,

I wondered what I should say to Mother. When I got home, I told

her what happened . To my great joy, Mother didn’t get anger at all.

Instead, she praised me for that I had done.  

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可作为SLE特异性标志的自身抗体是()

A.抗ssDNA和抗Sm

B.抗DsDNA和ANA

C.抗DNP和抗Sm

D.抗DsDNA和抗Sm

E.抗DNP和抗DsDNA

题型:问答题 简答题

大咯血窒息的抢救应采取()位。

题型:问答题 简答题

一般列广网路所使用的喇叭为()W。

A.1W

B.4W

C.3W

D.8W

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