问题 多项选择题

消除机床刚度对加上孔孔距精度影响的主要措施有()。

A.注意导轨维护,使之润滑良好

B.尽量减少主轴移动

C.尽量减少工作台移动

D.工件应尽量装夹在工作台中间,使机床受力均匀

E.加强刀具系统刚度,主轴不宜伸出过长

F.合理选用切削用量

答案

参考答案:D, E, F

不定项选择
阅读理解

阅读理解。

    Here is the Eight O'clock News. …

    Chinese people spent about 120 billion yuan during the first three days of the May Golden Week last year.

This year it has increased to 140 billion yuan.

    The children of Beijing No.2 Middle School sang with students from Toronto in Canada to celebrate the 20th

anniversary. They had been sister schools since 1986. They spent about two weeks together in Beijing. They

visited the Great Wall and the Summer Palace. They took a lot of photos in Beihai Park.

    Have you ever got tired of heavy shopping bags? A new shopping assistant robot which was invented by a

Japanese company could be the answer. The helpful robot can follow you around and carry several bags. The

robot was tested at a shopping center in February 2006.

    About 500 people from different countries were in the 2006 "Rock Paper Scissors (剪刀)" World Match in

Canada. This event was founded in 1842. It is said that playing this game is fun, and also a good way to solve

problems among people.

    And now it's time for Morning Music.

1. The students from Canada and Beijing No. 2 Middle School didn't _____. [ ]

A. take photos

B. visit places of interest

C. sing songs

D. have a football match

2. Which of the following is NOT talked about in the news? [ ]

A. The robot can help with shopping bags.

B. A Japanese company invented the robot.

C. The robot was tested at a shopping centre.

D. There are such robots in people's homes now.

3. Which of the following is a game? [ ]

A. Shopping assistant robot.

B. May Golden Week.

C. Rock Paper Scissors.

D. A visit to the school.