在对塔的操作中,如果减少回流量,会使塔压力有所上升。

题型:判断题

问题:

在对塔的操作中,如果减少回流量,会使塔压力有所上升。

考点:催化重整装置操作工催化重整装置操作工题库
题型:判断题

对于不重合的两个平面α与β,则“存在异面直线l、m,使得lα,lβ,mα,mβ”是“αβ”的(  )

A.充分不必要条件

B.必要不充分条件

C.充要条件

D.既不充分又不必要条件

题型:判断题

Your homework habits might be affecting your grades. Are you feeling tired or bored when it comes to homework time? Are you arguing with parents about your grades? You can change the way you feel by taking better care of your mind and your body. Get the sleep you need.

Studies show that teens' natural sleeping habits are different from those of adults. This often causes less sleep among teens, since they tend to have trouble going to sleep at night, and have trouble waking in the mornings. You can avoid some of the problems that come with less sleep by changing some of your nighttime habits.

Improve your memory

A great way to improve your homework habits is to improve your memory with brain exercise. There are many theories and ideas about improving memory, but there is one mnemonic(记忆的) method that has been around since ancient times. Ancient accounts show that early Greek and Roman orators used the “loci” method of remembering long speeches and lists. You may be able to use this method to improve your memory at test time.

Fight the desire to delay

Do you get the sudden desire to feed the dog at homework time? Don't fall for it! Delay is like a little white lie we tell ourselves. We often think we'll feel better about studying later if we do something fun now, like playing with a pet, watching a TV show, or even cleaning our room. It's not true.

Avoid repetitive(重复的) stress

During text messaging, Internet surfing, and computer writing, you are using your hand muscles in all new ways, and you're very easily to be influenced by something dangerous or the repetitive stress injury. Find out how to avoid pain in your hands and neck by changing the way you sit at your computer.

小题1:What differences between the teens and adults are mentioned in the passage?

A.Eating habits.

B.Sleeping habits.

C.Reading habits.

D.Writing habits小题2:      can help people to improve the memory.

A. Using the brain more     

B. Doing morning exercises every day

C. Dancing after meals      

C. Listening to the music

小题3:What should people do to avoid the repetitive stress when they playing computer?

A.Changing the way they sit.

B.Cutting the time.

C.Wearing some special glasses.

D.Using the hand muscles in a new way.小题4:Which statement is NOT right according to the passage?

A.Homework habits can affect the study grade.

B.Only Roman orators were able to use the “loci” method to remember.

C.It's not good to desire to feed the pets when you are doing the homework.

D.There are four ideas of behaving Healthy Homework Habits mentioned.

题型:判断题

 (A类题)某同学质量为60kg,在军事训练中要求他从岸上以2m/s的速度跳到一条向他缓缓飘来的小船上,然后去执行任务,小船的质量是140kg,原来的速度是0.5m/s,该同学上船后又跑了几步,最终停在船上.则此过程该同学动量的变化大小为______kg.m/s,此时小船的速度大小为______m/s.

题型:判断题

2008年6月1日北京奥运圣火在宜昌传递,圣火传递路线分为两段,其中在市区的传递路程为700(a﹣1)米,三峡坝区的传递路程为(881a+2309)米.设圣火在宜昌的传递总路程为s米,

(1)用含a的代数式表示s;

(2)已知a=11,求s的值.

题型:判断题

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