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问题 问答题 简答题

表面粗糙度与机械零件的使用性能有着密切相关的关系，主要表现在哪几方面？

答案

参考答案：

（1）对配合性质的影响；

（2）对接触面刚度的影响；

（3）对抗疲劳性能的影响；

（4）对密封性能的影响。

单项选择题

设备工程的( )是工程设备移交给业主的最后阶段，也是风险较大的阶段，无论对设备还是对人身的安全都至关重要。

A．设计

B．调试和试运行

C．组装

D．制造
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填空题

another; like; area; those; health; there; angry; sound; look; art; more; way
Why do so many people around the world love Chinese cooking In China, cooking is an (66) , just like music, dance and painting. However, there is (67) than just one kind of Chinese food. Different areas in China have special (68) of cooking because of the differences in weather and geography.
Traditional Chinese doctors believe we need a balance of yin and yang to be (69) Maybe you should eat yang foods, (70) beef when you feel weak or tired. And you should eat yin foods like tofu while you are too stressed out or (71) The Chinese believe people who eat a balanced diet should be healthier than (72) who only eat foods that taste good.
(73) is much more to Chinese food than just taste. Behind many dishes are traditions with deep meaning. One Chinese food tradition is to eat long noodles on your birthday as a symbol of long life. (74) traditional food, yuan xiao, suggests that a family will always stay together. On the Spring Festival, people often eat fish, because yu (75) like the word meaning "more than enough".
From north to south, east to west, people are sure to find some kind of Chinese food to suit their taste and interest.
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