测微仪是用相对法来测量工件的尺寸,也可用来侧零工间的() A.表面硬度 B.表面粗糙

题型:单项选择题

问题:

测微仪是用相对法来测量工件的尺寸,也可用来侧零工间的()

A.表面硬度

B.表面粗糙度读

C.配合精度

D.形状和位置误差

考点:金属工艺学机械加工机械加工题库
题型:单项选择题

阅读理解。

     London's River Thames has twenty-seven bridges. But Tower Bridge, the first bridge over the

Thames as you travel to London from the sea,is the most famous of them all. What makes Tower

Bridge so exciting? Why do visitors come from all over the world to see it?

    The thing that is surprising about Tower Bridge is that it is open in the middle. It does this to let the 

 big ships through to the Pool of London.lf you are lucky enough to see the bridge with its two opening

arms high in the air,you will never forget it.

    On its north side stands the Tower of London it self.Although they look the same age,the Tower is

almost a thousand years old,and Tower bridge is only about one hundred, It was built in the 1890s.

By1850, everyone agreed that a bridge across the Thames near the Tower was most necessary. But

the designers argued about the new bridge for another  thirty years.This took so long because they had

two big problems.

l. Tower Bridge is ______.

A. about one thousand years old

B. the oldest and the most famous bridge in London

C. the first one you can see when you go from the sea to London

D. the one that took workers about 30 years to build

2. The Tower of London is ______.

A. across from the Thames

B. on the north of Tower Bridge

C. in the middle of Tower Bridge

D. much younger than Tower Bridge

3.Which of the following is NOT true according to the passage?

A. You can see the bridge with its two opening arms high in the air at anytime.

B. By 1850 everybody thought it most necessary to have a bridge built across the

    Thames near the Tower.

C. It took the designers thirty years to argue about the bridge before it was built.

D. It was no easy thing to build a bridge near the Tower.

4. Why is the bridge open in the middle?

A. To make it special.

B. To attract (吸引) more people from the world to see it.

C. To let the big ship through to the Pool of London.

D. BeCduse it is so long that has to be divided into two parts.

5. How long was the Tower Bridge built?

A. A thousand years.

B. A hundred years.

C. Five thousand years.

D. Five hundred years.

题型:单项选择题

干熄焦循环风量测点设置在()。

A.锅炉内部

B.1DC区域

C.风机出口

D.2DC与风机之间

题型:单项选择题

插销连接器徐动机构是插销的机械连锁装置,它的作用是实现插销连接器的()功能。

A.漏电保护

B.过载保护

C.短路保护

D.断电隔爆

题型:单项选择题

国家相关作业规范中提出的煤气安全“十禁止”包括哪些内容?

题型:单项选择题

19世纪中期阻碍德意志发展的主要因素是()

A.军国主义传统

B.君主专制制度

C.封建割据状态

D.民族分歧与争端

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