轻苯酸洗净化过过程中,浓硫酸的主要作用是()。

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问题:

轻苯酸洗净化过过程中,浓硫酸的主要作用是()。

考点:洗涤工洗涤工高级洗涤工高级题库
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希望小学新建一个底面直径为20米,深2米的圆柱形储水池.

(1)沿着游泳池的内壁1.5米高处用白漆画一条水位线.水位线的全长是多少米?

(2)按水位线进水,游泳池内共储水多少立方米?

题型:填空题

与肾MRI扫描参数不符的是()

A.脉冲序列:SE、TSE、TFE、FSPGR等

B.采集模式:2D,MS

C.重建矩阵:256×256,512×512,1024×1024

D.FOV:350mm

E.层厚:1~2mm

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阅读理解。

     Many Chinese have been greatly shocked by the traffic accident caused by the drunk driver Sun

Weiming, who has killed five and injured some others in Chengdu, Sichuan. However, such a case is not

rare.    

     Today, traffic accidents may have been regarded as a social problem. The car has killed and disabled more people in its brief history than any bomb or weapon ever invented. Much of the blood on the street

flows actually from rude behavior of drivers who refuse to respect the legal and moral rights of others. In

fact, the enemies of society on wheels are rather harmless but just ordinary people acting carelessly, you

might say. But it is a principle both of law and common morality that carelessness is no excuse when one's actions could bring death or damage to others. A minority of the killers go even far beyond carelessness

that can be imagined.    

     Researchers have estimated that as many as 80 percent of all automobile accidents can be attributed to the psychological condition of the driver. Emotional upsets can change drivers' reactions, slow their

judgment, and make them blind to the dangers that might otherwise be evident. The experts warn that it is

vital for every driver to make a conscious effort to keep his/her emotions under control.    

     Yet the irresponsibility that accounts for much of the problem isn't only put upon drivers. Street walkers regularly ignore or break traffic regulations. They are blamed in most vehiclewalker accidents, and many

cyclists even believe that they are not subject to the basic rules of the road.    

     Significant legal advances have been made towards safer driving in the past few years. Safety standards for vehicles have been raised both at the point of manufacture and through regular road inspections. In

addition, speed limits have been lowered. Due to these measures, the accident rate has decreased. But the accident experts still worry because there has been little or no improvement in the way drivers behave. The only real and lasting solution, say the experts, is to make people believe that driving is a skilled task

requiring constant care and concentration. Those who fail to do all these things present a threat to those

with whom they share the road.

1. Traffic accidents may be regarded as a social problem because _____.  

A. auto driving has become dangerous and harmful in today's society  

B. people usually pay no attention to law and morality when driving  

C. they have caused serious psychological problems among drivers  

D. the car has killed and disabled more people than any weapon in history

2. Who are NOT mentioned to be responsible for the road accidents in the passage?  

A. Careless bicycleriders.  

B. Careless people walking in the street.  

C. Irresponsible auto drivers.  

D. Irresponsible auto manufacturers.

3. By discussing solutions to traffic accidents,  the author seems to be _____.

A. doubtful and hopeless  

B. angry and disappointed

C. objective and concerned

D. anxious and annoyed

4. The author writes this passage to _____.  

A. show his worries about drunk driving  

B. help protect street walkers from car accidents  

C. discuss traffic problems and possible solutions  

D. warn auto drivers to refuse drunk driving

题型:填空题

某冷却塔为有除水器的机械通风冷却塔,进塔气温24℃,塔冷幅宽为5℃,当采用浓缩倍数N=4时,其循环水补充水率为()。

A.0.72%

B.0.79%

C.0.86%

D.0.96%

题型:填空题

在群落演替研究过程中,出现哪两种演替观?

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