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问题 单项选择题

滑轮组在工作时因摩擦和钢丝绳的刚性的原因，要产生运动阻力，致使每一分支跑绳的拉力不同，拉力( )。

A．最小在拉出端

B．最小在固定端，最大在拉出端

C．最大在固定端

D．最大在固定端，最小在拉出端

答案

参考答案：B

改错题

下面短文中有10处错误,每句最多2处错误,请在有错误的地方增加、删除或修改某个单词。

增加：在缺词处加一个漏字符号(∧)，并在其下面加上该加的词。

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.每处错误及其修改仅限一词；

2.只允许修改10处，多者（从11处起）不计分。

Once a man got on a bus for New York. He hid in toilet, because he did not want to pay.  But a passenger saw her. She tapped the person in front of her on the shoulder and say, "There's a  bum(流浪汉) in the toilet. Tell the bus driver."The message was past from person to person. But anywhere along the way, it changed. The bus  driver was told that there was a bomb in the toilet. He immediate stopped the bus and telephoned the police. When the police came in, they told the passengers to get off the bus or stay far away. Then  they closed the highway. This soon caused a 15-miles-long traffic jam. Under the help of a dog, the police searched for two hours. Of course they found no bomb!
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问答题 简答题

尾气净化炉紧急停工内容有哪些？
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