问题 单项选择题

当轴与孔要靠配合面传递载荷时,应该选用()。

A.间隙配合

B.过渡配合

C.过盈配合

D.紧密配合

答案

参考答案:C

解析:轴和孔之间的配合要求有三种情况:①轴和孔配合后有相对运动(转动或移动)的要求,应选用间隙配合;②轴和孔靠配合面传递载荷时,应选用过盈配合;③轴和孔配合后要求有定位精度,而且经常拆卸的,主要选用过渡配合,但也可以根据情况选用较小间隙的间隙配合或较小过盈的过盈配合。

阅读理解

Here is a story told about an American general who was a very important figure in the American army during the First World War. Everybody in the United States knew him and many people wished to have a picture or something of his in their homes.

Soon after the war the general returned to Washington. One day he went to a dentist and had six teeth pulled out. A week later the general heard that his teeth were being sold in curiosity shops as $ 5 each. On each of the teeth there was a label with the name of the general and words: “Buy these teeth and show them to your friends at home.” The general got angry. He rushed to his office and ordered six officers to go around the city and buy all his teeth.

The officers went out and visited every curiosity shop in the capital. They were away from the office all day. In the evening they returned and put on the table in front of the general the teeth they had bought. They had collected 175 teeth.

小题1:The general returned to Washington ______.

A.during the war

B.after civil war

C.after 1945

D.after 1918小题2:The general’s teeth were sold in ______.

A.the museum

B.the special shops selling some rare and interesting things

C.the department store

D.the hospital小题3:The general ordered his men to ______.

A.look for his teeth and buy all of them

B.arrest the dentist at once

C.make all the shops stop selling teeth

D.buy all the teeth in all the shops小题4:In the evening, the officers went back with all the teeth which cost ______.

A.$ 785

B.$ 1,050

C.$ 157

D.$ 875

填空题