燃料油在某加热炉燃烧后所生成的烟气中,经分析含二氧化碳的体积百分数为8%,加热炉过剩

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问题:

燃料油在某加热炉燃烧后所生成的烟气中,经分析含二氧化碳的体积百分数为8%,加热炉过剩空气系数α为1.30,则燃烧生成的烟气中含氧的体积百分数为()。

A.4.5%

B.5.4%

C.3.9%

D.6.2%

考点:常减压装置考试高级常减压装置高级常减压装置题库
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某人设计了一个游戏,在一网吧征求了三位游戏迷的意见,就宣传“本游戏深受游戏迷欢迎”,这种说法错误的原因是(  )
A.没有经过专家鉴定
B.应调查四位游戏迷
C.这三位玩家不具有代表性
D.以上都不是
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17岁的少年周某,初中没毕业就辍学。一次在菜市上闲逛,捡到一个“大灵通”电话。由于机主第二天就停机了,他只能拨通一些免费电话,于是他不断用这部“大灵通”取闹。在半个月内恶意骚扰该市“119”消防指挥调度中心达500多次。后经该市公安消防支队连续追踪调查,终于把这名“玩火”者抓获。这说明[ ]

①一些人不能很好的对自己负责,是因为对后果缺乏正确认识和估计 

②要加强道德修养,提高判断能力,对自己行为负责 

③对自己的行为缺乏正确认识,就会做错事,给社会和别人带来伤害 

④青少年缺乏判断是非的能力,不可能对自己的行为后果作出正确判断

A.①②③        

B.②③④           

C.①②④           

D.①③④

题型:单项选择题

Can you remember the day when you spoke your first word? If you can, you are unusual. Try to imagine what first few months of your life were like. I am sure you just spent most of your time eating, sleeping and crying. As you grow older, you were awake more of the time. It took your parents more time to play with you and talk to you. You watched and listened curiously. You began to know that people made certain sounds to go with certain things.

Then you began to try making the sounds you heard. And step by step you were able to make the right sound for one thing.On that day you came to understand the secret of language. The secret is that a certain sound means a certain thing. One sound might be as good as another. But it is no good as a word unless everybody agrees on its meaning. Only when a group of people use the same set of sounds of things, can they understand each other. Then, and only then do these people have a LANGUAGE.

After you found the secret of language, you learned words. Some of the words meant things, such as BOOKS, CHAIRS and SHOES. Some words meant doing things, such as GO and SWIM. And other words describe things, such as GOOD and DIRTY. Soon you learned to put words together to express one’s idea, such as “I want to go out and play with my friends.” This is language. By means of language people can communicate. So we say languages are means of communication.

小题1:When you were a little baby, you_________.

A.made sounds to let people know that you wanted to eat

B.spent most of your time playing with your parents

C.could not hear any sound around you

D.spent most of your time eating, playing and crying小题2:The secret of language is that___________.

A.one sound might be as good as another

B.people can understand each other

C.a certain sound is for a certain thing

D.there is a special sound for each person小题3:You could learn words__________.

A.before you knew what the language was

B.after you knew what the language was

C.if you knew the secret of the language

D.when you were a baby小题4:The aim in using language is___________.

A.to get everying one wants from others

B.to say what one wants to know

C.to share ideas, opinions, news, etc with one another

D.to make oneself understood by others

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金属粉末的基本性能包括();()、颗粒形状和大小以及技术特征等。

题型:单项选择题

冠心病患者出现心前区收缩期喀喇音及收缩中期吹风样杂音,是由于()

A.心肌硬化

B.室间隔穿孔

C.二尖瓣脱垂

D.二尖瓣相对关闭不全

E.心力衰竭

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