合成氨工业对国民经济和社会发展具有重要的意义.对于密闭容器中的反应:N2(g)+

题型:选择题

问题:

合成氨工业对国民经济和社会发展具有重要的意义.对于密闭容器中的反应:N2(g)+3H2(g) 

2NH3(g)(正反应为放热反应),673K、30MPa下,n(NH3)和n(H2)随时间 t变化的关系如图所示.下列叙述中,正确的是(  )

A.点c处正反应速率和逆反应速率相等

B.点a的正反应速率比点b的大

C.点d(t1时刻)和点e(t2时刻)处n(N2)不同

D.在t2时刻,正反应速率大于逆反应速率

考点:化学反应的限度
题型:选择题
任务型阅读
There are many things you can do to improve your memory(记忆力). Among them are many kinds of useful ways are well as taking special care of your health.
It is important that you make yourself excited to make your memory more active. You can do this by doing some new activities and by changing your daily habits(习惯). Learning a new skill helps your brain(大脑)to develop. When trying to remember something, you should pay special attention to the most important things about it .Do not allow other thoughts to enter your mind because this will reduce your chances of making right memories. An excellent way to help memory is to connect information with pictures. Try to see the pictures in your mind. Taking notes and keeping a diary will also be helpful.
Healthy food and plenty of vitamins are necessary for your memory to work well. Drinking a lot of water also helps keep your memory. You must allow your brain to have enough sleep and rest. When you are asleep, your brain stores memory. Not enough sleep can cause problems with storing information .And being tired will also stop you from being able to think clearly and well.
In order to keep your mind on your work, you must be free from worry. Generally keeping fit and normal health checks are both important as well-not just for improving your memory.
Title
How to ___小题1:__Your Memory
Main__小题2:
Looking _小题3:_ your health well specially
 
Making yourself excited to make your memory more active by _小题4:_in some new actvities and changing your daily habits.
 
Paying attention to the most _小题5: things, in order to add to your chances to __小题6:_ right memories
 
Connecting information with _小题7:_
 
Taking notes and keeping ___小题8:___
Other ways
Eating _小题9:_food and taking plenty of vitamins
 
Drinking a lot of water
 
Having __小题10:___sleep and rest
题型:选择题

I'll wait for you at the gate of the Music Hall. See to____that you'll get there on time.       [      ]

A. yourself          

B. it              

C. all          

D. everything

题型:选择题

二尖瓣附着于()。

A.左房室口周围

B.右房室口周围

C.右心室流出道口周围

D.左心室流出道口周围

E.右心房的最下部,卵圆窝的右下方

题型:选择题

如图是人体心脏结构示意图,请据图回答下列问题.

(1)在心脏的四个腔中,心脏壁最厚的是[B]的壁.

(2)在心脏的四个腔中,充满静脉血的心腔有和______.(填字母)

(3)在心脏结构的A与B之间、C与D之间有防止血液倒流的结构是______;在心室与动脉之问有防止血液倒流的结构是______.

(4)在人体的血液循环中,肺循环的起始部位是______.(填字母)

题型:选择题

二级破坏超压值为()。

A.0.06kgf/cm2

B.0.50kgf/cm2

C.0.08~0.10kgf/cm2

D.0.15~0.20kgf/cm2

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