球轴承适用于轻载、高速和要求旋转精度高的场合。

客运站经营者申请二级客运站的，应向（）提交客运站站级核定申请。

A．省级道路运输管理机构

B．市道路运输管理机构

C．县道路运输管理机构

D．所在地的道路运输管理机构

根据课文内容用适当的词填空，使短文完整。(一空一词)

    The computer began as a calculating machine in 1642 in France. Then in 1822, it was

built 1.______ an analytical machine, which 2.______ instructions from cards with holes.

In 1936 Alan Turing wrote a book 3.______ (describe) how computers could 4.______ (make)

to work,and built a "universal machine" 5.______ (solve) any mathematical problem.

    At the beginning, the computer was huge, the 6.______ of a large room. 7.______ years

go by, it becomes smaller and smaller, especially 8.______ it got new transistors in the

1960s, it has become smaller and smaller, and 9.______ artificial intelligence, it is

getting cleverer and cleverer, quicker and quicker.

    In 10.______ early 1960s, computers could be connected by a network, 11.______ enables

their users 12.______ information with others and talk to each other. Since computers

13.______ into people's homes, computers are used by billions of people 14.______

information and communicate with each other around the whole world by the 15.______.

项目监督的核心是( )。

A．质量、进度和成本管理

B．合同管理和信息管理

C．施工组织管理

D．财务管理、资金运作和投资效益

饲料厂大多数电动机为（）。

A：单相异步电动机

B：两相异步电动机

C：三相异步电动机

在使用霍尔片时，减小霍尔片不等位电势通常最行之有效采用的方法是（）。

A、机械修磨

B、化学腐蚀

C、补偿网络进行补偿

D、无法解决