问题 问答题 简答题

简要回答机械密封装配的注意事项?

答案

参考答案:

1.机械密封的装配要干净光洁。2.修整倒角倒圆。3.安装时应涂抹少许机油,以减少摩擦,并避免损坏零件。4.装配辅助密封圈。5.机械密封的压缩量。6.尽量借助机械把静环组件装入压盖。7.旋转型的动环组件或静止型的静环组件组装完毕后,应检查是否到位及灵活。弹性开口环是否定位可靠。8.检测验证密封端面对轴中心线的垂直度。9.对静止型机械密封,推进静环组件时,销槽要对准销子,并检查是否安装到位。10.拧紧压盖螺栓时,用力均匀、对称、小心,分几次拧紧,以免损坏部件。

阅读理解

首先,请阅读下列的应用文 :

A. Chapter One.…You probably have an image in your mind of what the  " perfect"  or " ideal"  body looks like. Try not to press yourself to look that way. Each person is born with genes that control the shape of his / her body. Everyone is different. It's important to be comfortable with the body you have.

B. Chapter Two…You use energy for everything you do. That energy comes from the food you eat. Too much food or too little exercise causes your body to store the extra energy in fat cells. But , if you exercise regularly and eat a healthy diet, you'll feel healthier and stronger not to mention Iook great.

C. Chapter Three… Your body runs best on foods high in carbohydrates and low in fat and sugar. Eating a healthy diet will provide your body with everything it needs to run smoothly. Your body breaks down

proteins into amino acids(氨基酸) , so you don't need to take in the amino acids separately.

D. Chapter Four.…Fxercise does more than just burn calories. For instance, regular exercise makes your muscles strong and flexible, and increases the amount of muscle you have. It also makes your heart stronger and lowers your blood pressure.

E. Chapter Five.…Always warm up and stretch for 5-10 minutes before you do strength or endurance

exercises. Afterwards, take 10 minutes to cool down. Your heart should beat normally when you stop.

Exercising with a group may help you to exercise regularly.

F. Chapter Six…Supplementation of a mixture of essential amino acids will increase protein synthesis

(蛋白质综合体. While supplementing with either carbohydrate or amino acids may limit muscle damage

and stimulate(激励)protein synthesis, there is increasing evidence that the combination can have an

addictive effect.

    以下是与上述章节相关的读者,请匹配读者和他/她需要了解的相关信息的所在章节.

1. Charity. He always breathes heavily and his heart beats irregularly when he finishes his exercise. He

wonders whether there is something wrong with his body or whether he is not suited for physical exercises.

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2. Wander. She likes eating meat a lot every day as she thinks that meat can provide people with energy. Besides , she does sports on weekends. However, she is not energetic enough to face the pressure.

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3. Helly She has tried  many ways of keeping fit but she still gets fat because of stress from work. She

doesn't look well.

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4. Tammy.He is a Grade One college student majoring in gymnastics. He must write a passage about

what a healthy body is.

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5. Pandy. He is a coach,working in a gym.He will start a new course next month on how to lose weight.

For the first few lessons, he is going to talk about why people have to exercise.

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