升降式止回阀的流体是由低端进入阀内,由于阀前后流体的( )所产生的推力大于阀瓣重力而

题型:单项选择题

问题:

升降式止回阀的流体是由低端进入阀内,由于阀前后流体的( )所产生的推力大于阀瓣重力而将阀瓣顶开,流体由阀瓣与密封圈环缝通过高端流出阀体.

A.压力

B.推力

C.压差

D.冲击力

考点:输气工考试输气工中级输气工中级题库
题型:单项选择题

-- Do you know Susan?    

-- Yes. She is a beautiful girl but she is _____ quiet.    [ ]

A. a bit of  

B. a little  

C. little bit

题型:单项选择题

当一个文档窗口被关闭后,该文档将( )。

A.保存在外存中
B.保存在内存中
C.保存在剪贴板中
D.既保存在内存也保存在外存中

题型:单项选择题

阅读理解

     __1__  Many things can become distractions (分散注意力). Your ability to focus your mind,

emotions and physical movements will directly influence your success. Staying focused on the task

at hand can be easier said than done. Here are some powerful techniques that can help you improve

your ability to focus.

     For physical control, it helps to have a constant exercise schedule. __2__ Exercising helps you

gain better command of your body, and even goes beyond the body, giving you more flexibility not

just physically but also emotionally and mentally.  When you feel more comfortable in your body,

you increase your selfconfidence, which helps you feel more relaxed.

     For mental control, meditation (沉思;冥想) does the task. __3__  It's easy to get distracted

by things in your background, but in order to perform well you have to maintain a high degree of focus.

When you relax your thoughts it trains your mind to deal effectively with outside distractions so you

can stay centered on what matters most at the moment.

     __4__ It prevents you from overreaction and also from overacting. When your emotions settle

down, you gain greater awareness of the environment you're in, and feel calm and in control.

    __5__ The good thing is that selfcontrol can be developed.  Start exercising frequently, get yourself

into meditation, and start to feel positive changes in your career and your life in general.

A. In short, focus requires selfcontrol.

B. There are many benefits of exercising.

C. Generally speaking, you need to practise a lot.

D. There are still some disadvantages of exercises.

E. Your emotions are well served by meditation as well.

F. Focus is an important part of success and achievement in general.

G. It helps block out all the noise and activities that are going on around you.

题型:单项选择题

玉屏风散的功用有:()

A.固表

B.涩肠

C.止遗

D.固冲

E.补肾

题型:单项选择题

()是清初画坛“四僧”之一,八大山人之一,画风怪异。为明太祖朱元璋的第十七子宁献王朱权的九世孙子。明朝覆灭后,他便假装聋哑,隐姓埋名遁迹空门,潜居山野,以保存自己。

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