物质的量浓度都为0.1 mol·L-1的CH3COOH与NaOH溶液等体积混合后

题型:选择题

问题:

物质的量浓度都为0.1 mol·L-1的CH3COOH与NaOH溶液等体积混合后,下列关系式不正确的是

A.c(Na+)>c(CH3COO)>c(H+)>c(OH)

B.c(Na+)+c(H+)=c(OH)+c(CH3COO)

C.c(OH)=c(H+)+ c(CH3COOH)

D.c(CH3COOH)+ c(CH3COO)= c(Na+)

考点:盐水解的影响因素水解方程式盐类水解判断溶液酸碱性或比较溶液pH值的大小盐类水解的定义
题型:选择题

在逆行性尿路造影检查中,可出现哪些肾脏回流征象()

A.肾小盏回流

B.肾大盏回流

C.肾小管回流

D.肾窦回流

E.淋巴管回流

题型:选择题

作家写小说主要是一种______。

A.创造想象

B.无意想象

C.记忆表象

D.再造想象

题型:选择题

(1).青霉素类属于()
(2).四环素类属于()
(3).氨基苷类属于()
(4).磺胺药属于()

A.繁殖期杀菌药

B.静止期杀菌药

C.速效抑菌药

D.慢性抑菌药

题型:选择题

阅读理解。

     Modern inventions have speeded up people's loves amazingly. Motor-cars cover a hundred miles in little

more than an hour, aircraft cross the world inside a day, while computers operate at lightning speed. Indeed,

this love of speed seems never-ending. Every year motor-cars are produced which go even faster and each

new computer boats (吹嘘) of saving precious seconds in handling tasks.

     All this saves time, but at a price. When we lose or gain half a day in speeding across the world in an

airplane, our bodies tell us so. We get the uncomfortable feeling known as jet-lag; our bodies feel that they

have been left behind on another time zone. Again, spending too long at computers results in painful wrists

and fingers. Mobile phones also have their dangers, according to some scientist; too much use may transmit

harmful radiation into our brains, a consequence we do not like to think about.

     However, what do we do with the time we have saved? Certainly not relax, or so it seems. We are so

accustomed constant activity that we find it difficult to sit and do nothing or even just one thing at a time.

Perhaps the days are long gone when we might listen quietly to a story on the radio, letting imagination take

us into another world.

     There was a time when some people's lives were devoted simply to the cultivation of the land or the care

of cattle. No multi-tasking there; their lives went on at a much gentler pace, and in a familiar pattern. There

is much that we might envy about a way of life like this. Yet before we do so, we must think of the hard tasks

our ancestor faced: they farmed with bare hands, often lived close to hunger, and had to fashion tools from

wood and stone. Modern machinery has freed people from that primitive existence.

1. The new products become more and more time-saving because _____.

A. our love of speed seems never-ending

B. time is limited

C. the prices are increasingly high

D. the manufactures boast a lot

2. What does "the days" in Paragraph 3 refer to?

A. Imaginary life.

B. Simple life in the past.

C. Times of inventions.

D. Time for constant activity.

3. What is the author's attitude towards the modern technology?

A. Critical.

B. Objective.

C. Optimistic.

D. Negative.

4. What does the passage mainly discuss?

A. The present and past times.

B. Machinery and human beings.

C. Imaginations and inventions.

D. Modern technology and its influence.

题型:选择题

在星形连接的电路中,三个末端连在一起的点叫()。常用符号()表示,从该点引出的线叫()线,如果该点接地则此线称()线。

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