试题与答案

离心式压缩机进行出口节流调节时,将出口阀开度关小,管网阻力() A.不变 B.增加

题型:单项选择题

题目:

离心式压缩机进行出口节流调节时,将出口阀开度关小,管网阻力()

A.不变

B.增加

C.减小

D.不变或减小

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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Weight loss is a hard topic. Lots of people aren’t satisfied with their present weight, but most people aren’t sure how to change it. You may want to look like the models or actors in magazines or on TV, but those goals might not be healthy or realistic(现实的) for you .  1  

So what should you do about your weight control?

   2   The best way to find out if you are at a healthy weight or if you need to lose or gain weight is to talk to a doctor or dietitian (营养学家 ).

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   4   People who lose weight quickly by crash dieting or other extreme measures usually gain back all of the pounds they lost, because they haven’t permanently(永久地) changed their habits. Therefore, the best weight management ways are those that you can maintain for a lifetime.

Small changes are a lot easier to stick with (坚持做) than large ones. Try reducing the size of what you eat.    5   Once you have that down, start gradually introducing healthier foods and exercise into your life.

It’s a good idea to maintain a healthy weight because it’s just that: healthy.

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B.Try to pay attention as you eat and stop when you’re full.

C.Weight management is about long-term success.

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F.Changing from whole to nonfat or low-fat milk is also a good idea.

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