某同学用物质的量之比为1∶1的NaNO3和KCl的混合物进行实验:在10℃时,将

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问题:

某同学用物质的量之比为1∶1的NaNO3和KCl的混合物进行实验:在10℃时,将混合物逐渐加入到烧杯中的水中,一边加一边搅拌。根据下表四种盐在10℃时的溶解度进行判断,上述实验过程中最先析出的晶体是

 NaNO3KNO3NaClKCl
溶解度(g)80.520.935.731.0
 

A.NaNO3     B.KNO3       C.NaCl       D.KC1

考点:溶液浊液胶体
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如图甲所示,Q1、Q2为两个固定点电荷,其中Q1带正电,它们连线的延长线上有a、b两点.一正检验电荷以一定的初速度沿直线从b点开始经a点向远处运动,其速度图象如图乙所示.则(  )

A.Q2带正电

B.Q2带负电

C.检验电荷从b到a的过程中动能增大

D.检验电荷从b到a的过程中电势能减小

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生活饮用水中制定了三氯甲烷和四氯化碳的标准,其原因是()

A.这两种物质可恶化水的感官性状

B.这两种物质可损害肾脏,引起人群的慢性中毒

C.二者均具有一定的致癌作用

D.进行氯化消毒时可产生氯化副产物

E.以上都不是

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建设在居民区的某羽绒(毛)加工企业建设项目,按照现行相关法律法规之规定,可在( )阶段征求公众对该项目可能造成环境影响的意见。

A.可行性研究

B.环境影响评价

C.环评文件审批

D.正式营业

E.建成试营业

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阅读理解。

     Do you sometimes argue about what seems to you to be simple fact? Do you argue whether it's cold

outdoors or whether the car in front of you is going faster than the speed limit?

     If you get into such arguments, try to think about the story about the six blind men and the elephant.

The first blind man who felt the elephant's trunk said it was like a snake. The second who felt the elephant's

side said it was like a wall, while the third said it was like a spear as he touched the animal's tusk. The fourth,

who got hold of the elephant's tail insisted that it was like a rope. The fifth man said it looked like a tree as he

put his arms around one of the elephant's legs. The sixth, who was tall and got hold of the elephant's ears,

said it was like a huge fan.

     Each man's idea of the animal came from his own experience. So if someone disagrees with you about a

"simple fact", it's often because his experience in the matter is different from yours.

     To see how hard it is for even one person to make up his mind about a "simple fact", try this simple

experiment. Get three large bowls. Put ice water in one. Put hot water in the second. Put lukewarm water in

the third. Now put your left hand in the ice water. Put your right hand in the hot water. After thirty seconds,

put both hands in the lukewarm water. Your right hand will tell you the water is cold. Your left hand will tell

you it's hot!

1. What makes people think about simple facts differently?

A. The fact that simple facts differ from one another.

B. The fact that people have different experience in the same simple fact.

C. The fact that people often disagree with one another.

D. The fact that it's hard to make up one's mind about simple facts.

2. Which of the following temperatures can the word "lukewarm"be applied to?

A. Around 1℃

B. Above 60℃

C. Around 25℃

D. Below 0℃

3. After reading the last paragraph, we may think of _____.

A. Newton's law

B. Galileo's theory of falling objects

C. Einstein's theory of relativity

D. Marx's On Capital

4. The main idea of this passage is _____.

A. people often judge something according to his own experience

B. people often agree about simple facts

C. it's hard for a person to make up his mind about a simple fact

D. don't care too much about simple facts

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鼓泡床与湍动床流化性能的共同特性是什么?

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