下列表述的灭火方法,属于窒息法的是()。A.阻止空气流入燃烧区,或用不燃烧物质冲淡空

题型:单项选择题

问题:

下列表述的灭火方法,属于窒息法的是()。

A.阻止空气流入燃烧区,或用不燃烧物质冲淡空气,使燃烧物质断绝氧气的助燃而熄灭。

B.将灭火剂直接喷洒在燃烧着的物体上吸收热量,使可燃物的温度降低到燃点以下,终止燃烧

C.将燃烧物体与附近的可燃物隔离或疏散开,使燃烧停止

D.让灭火剂参加到燃烧反应过程中去,使燃烧过程中产生的自由基消失,形成稳定的或低活性的游离基,从而终止燃烧

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题型:单项选择题

阅读理解。

    Doing homework not only can help children master the knowledge they have learned. but also can

traintheir abilities of finishing the work alone. planning the time and doing the duties. But some children

don't like to complete the work. Why? There are some reasons.

    Some children feel it is very difficult to do their homework. Because they can't understand their teacher

 clearly, and cannot follow their teacher's teaching process (过程). Maybe there is something wrong with

their intelligence.

    But some children's intelligence is normal. They are even cleverer, but they don't listen to the teacher

carefully.  It is hard for them to sit well and pay attention to anything.  It needs to carry on the attention

centralized (集中注意力) training to help the children.

    Some children love their teacher and then they like the subject. Their interest depends on the teacher

who teaches them. So every teacher should be helpful and kind. It can make children love you arid the

subject you teach. So they can do their homework happily.

1. Doing homework can help children ___________.        

A. master the knowledge

B. train their abilities

C. learn new lessons

D. Both A and B

2. Some children find the homework difficult. Which reason is NOT right?      

A. They can't understand their teacher clearly.

B. They cannot follow their teacher's teaching process.

C. The intelligence of all the students isn't normal.

D. They don't listen to the teacher carefully.

3. What's the Chinese meaning of the underlined word "intelligence" ?

A. 作业   

B. 智商

C. 思想    

D. 方式

4. According to the last paragraph (段落), the writer thinks _________ is very important.      

A. a teacher              

B. a subject

C. attention            

D. homework

5. What is the best title of the passage?

A. Some children don't like their teacher.

B. Children's homework is very difficult.

C. Why don't some children like to do homework?

D. Why can't some children study the subjects well?

题型:单项选择题

关于记忆细胞的错误的是

A.参加淋巴细胞再循环
B.仅限于B细胞
C.已接受抗原刺激
D.再次遇到抗原时能迅速增殖、分化
E.可自下而上数月致数年

题型:单项选择题

随着社会经济水平的提高,发展资料的消费和享受资料的消费将会逐渐增加。 [ ]

A、正确

B、错误

题型:单项选择题

身居香港的一位中国人,从前是给清政府交税,后来改向英国交税,发生这种变化主要是因为从下列哪一个条约签定后开始的                                    (  )

A.《南京条约》

B.《马关条约》

C.《辛丑条约》

D.《北京条约》

题型:单项选择题

表示的含义是()

A.总体均数的标准误

B.总体均数的标准误估计值

C.样本均数的标准误

D.样本均数的标准误估计值

E.以上均不正确

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