题目内容

压缩机活塞环常用的切口形式有（）。

A. 直切口
B. 呈阶梯形的搭接口
C. 斜角为45º～60º的斜切口
D. ABC

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影响活塞环密封效果有一下几点：气缸椭圆、镜面粗糙和（）。

A. 活塞环变形、压力大小
B. 活塞环变形、活塞环槽不平
C. 活塞环槽不平、压力大小
D. 活塞环槽不平、压力太高

活塞环的密封原理是（）。

A. 阻塞为主，兼有节流
B. 节流为主，兼有阻塞
C. 只有阻塞
D. 只有节流

活塞式压缩机气阀常用结构形式是（）。

A. 环状阀
B. 网状阀
C. 直流阀
D. 组合阀

Write the correct paragraph number from the reading next to its main idea.①Silk was highly valued by rich Europeans.②Deadly illnesses were carried by travelers on the Silk Road.③Although the Silk Road brought many good changes to the world, it also brought bad changes.④The Silk Road is a collection of roads that joined the East and West.⑤As people from different countries met, cultures began changing.

A. 25641
B. 25614
C. 26514
D. 24615