悬浮在空气中的粉尘要处在()之间遇火才会发生爆炸。(A)一定浓度范围  (B)冷冻室

题型:单项选择题

问题:

悬浮在空气中的粉尘要处在()之间遇火才会发生爆炸。

(A)一定浓度范围 

(B)冷冻室 

(C)热解 

(D)冲击力

考点:消防员考试中级建(构)筑物消防员中级建(构)筑物消防员题库
题型:单项选择题

(9分)米饭是我们每天都要摄入的主食,是由水稻所结的谷子碾出的大米煮成的。

(1)水稻种子外面有         包被,所以水稻属于被子植物。

(2)世界上首位经过多年艰辛实验研究培育出高产杂交水稻的科学家是从我市安江农校走出,被誉为“杂交水稻之父”的          ,他用野生水稻与普通栽培水稻多次杂交,培育出产量很高的杂交稻新品种,这是利用生物多样性中的       多样性。

(3)水稻在海南岛一年可以种植三季,而在大陆其它地方只能种植二季或一季,影响这种现象的环境因素是            

(4)大米的主要营养成为是              ,这种有机物是水稻叶肉细胞通过        作用合成的。这一作用是绿色植物一种十分重要的生理作用,该作用不但为生物圈中所有生物提供了基本的食物来源,而且提供了呼吸作用需要的           ,同时减少了大气中的         含量,维持了生物圈中的碳—氧平衡。

(5)王大爷不小心把几粒稻种混在黄豆中播种到地里,这些稻种长出的水稻因缺水缺肥长得非常矮小,这种矮小的性状能不能遗传给下一代?             。(填“能”或“不能”)

题型:单项选择题

公安机关发现了一具尸体,为了寻找死因对其进行了尸体解剖,在其消化道的某一部位内抽取内容物进行化验,结果发现其中的脂肪类物质还没有被消化,蛋白质却已被初步消化,那么该部位应是 [ ]

A.口腔          

B.食道        

C.胃            

D.小肠

题型:单项选择题

塔板的漏液与( )有关,液沫夹带与( )有关。

湿球温度tw

A.(A) 不变

B.(B) 增加

C.(C) 减小

D.(D) 不确定

题型:单项选择题

阅读理解。

     When you are talking to somebody at a party, do you focus entirely on the person you are speaking

with or does your attention keep jumping around the room to all the other people there? General1y, if the

person is someone you really want to talk to, you will focus on him. Most other people will only get about half of your attention.

    You may think that this is OK, because if you don't really want to talk to him, then what does it matter

if you don't give him your full attention? Consider two things. First, you may just not realize the importance of that conversation. If you are at a networking meeting and you hope to meet the CEO of Company X,

but you end up talking to someone who has a low-level job at a different company, then you may let your

attention wander (走神) as you speak to him. But maybe you don't realize that this person has already

met the CEO and could introduce you. Do you think he will do that if he feels you don't really care about

speaking to him? This doesn't mean you need to spend the whole time talking to him. Five or ten minutes

of real attentive (专心的)conversation can be worth 30 minutes to an hour of partial attention.

     Second, whether you want to speak to someone is based on the situation. You can love your wife, but

if she tries to talk to you while you are watching something you like on TV, where is your attention going? Make your own decision, but if you want her to feel valued, give her your 100% attention. The nice thing

is that in many cases you can give her your attention for a few minutes and then return to what you were

doing. You miss very little, she feels valued, and all is good.

1. The author's opinion is made believable mainly by ________.

A using figures

B. giving examples  

C. asking questions

D. description

2. The second paragraph mainly tells you that ________.

A. you should be interested in everyone at a party

B. you can refuse to talk to someone you don't like at a party

C. you should focus on whoever you are talking to

D. you should be patient with everyone at a party

3. A person who has a low-level job probably ________.

A. would like to talk to you      

B. is well worth focusing on

C. wants to make friends with you    

D.  is the one you're looking for

4. If your wife wants to talk to you when you are busy, you should ________.

A. decide what to do according to the situation  

B. go on with what you are doing  

C. stop doing anything immediately

D. finish what you are doing with her

5. What is the main idea of this passage?

A. Always be friendly to others at a party.

B It is important for you to be active at a party.

C You should respect your wife at any time.

D Improve your communication skills by focusing on others

题型:单项选择题

切胶机出现停止系统故障仍能起到保护作用的部件是()。

A、上升开关

B、下降开关

C、上限位开关

D、下限位开关

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