问题 问答题 论述题

电厂设备检修时常采用的装配方法有哪些,适用范围是否一致?为什么?

答案

参考答案:

电厂设备检修时常采用的装配方法有完全互换法、选配法、修配法和调整法。它们的适用范围是不一致的。

(1)完全互换法适用于装配时各零件或部件能完全互换而不需任何修配、选择以及其他辅助工作的情况,装配精度由零件制造精度保证。

(2)选配法适用于装配前按比较严格的公差范围将零件分成若干组分别组合,因而不经过其他辅助工作仍能保证装配精度。

(3)修配法适用于装配时通过修整某配合零件的方法来达到规定的装配精度。

(4)调整法适用于装配时调整一个或几个零件位置,以消除零件间的积累误差来达到规定的装配精度。

选择题
单项选择题

I was a single parent of four small children, working at a low paid job. Money was always tight, but we had a (1) over our heads, food on the table, clothes on our backs, and if not a lot, always (2) . Not knowing we were poor, my kids just thought I was (3) . I’ve always been glad about that.

It was Christmas time, and although there wasn’t (4) for a lot of gifts, we planned to celebrate with a family party. But the big (5) for the kids was the fun of Christmas (6) .

They planned weeks ahead of time, asking (7) what they wanted for Christmas. Fortunately, I had saved MYM120 for (8) to share by all five of us.

The big (9) arrived. I gave each kid a twenty-dollar bill and (10) them to look for gifts of about four dollars each. Then everyone scattered. We had two hours to shop; then we would (11) back at the "Santa’s Workshop"

Driving home, everyone was in high Christmas spirits, (12) my younger daughter, Ginger, who was unusually (13) She had only one small, flat bag with a few candies—fiftycent candies I was so angry, but I didn’t say anything (14) we got home. I called her into my bedroom and closed the door, (15) to be angry again. This is what she told me.

"I was looking (16) thinking of what to buy, and I (17) to read the little cards on the ’Giving Trees’. One was for a little girl, four years old, and all she (18) for Christmas was a doll. So I took the card off the tree and (19) the doll for her. We have so much and she doesn’t have anything. "

I never felt so (20) as I did that day.

14()。

A.forced 

B.reminded 

C.invited 

D.begged