问题 问答题 简答题

锅炉点火前应进行哪些检查工作?

答案

参考答案:

(1)按锅炉冷态启动检查操作票“锅炉点火”栏进行全面检查,检查一项确认一项,确保各系统及设备符合启动要求;

(2)校对汽包双色水位计与控制室各水位计,并掌握其差值;

(3)通知各值班工检查空气预热器、引风机、送风机及点火风机具备启动条件,将空气预热器密封装置调整到上限位置;

(4)检查火焰检测器冷却风机在正常运行状态,风压正常;

(5)投入暖风器运行,控制其出口风温在50℃;

(6)与热工人员联系,确认锅炉保护及联锁均已试验合格并投入;

(7)确认各风门挡板均在正常位置;

(8)检查控制气源压力正常,且不低于0.6MPa。

选择题
单项选择题

With the possible exception of equal rights, perhaps the most controversial issue across the United States today is the death penalty. Many argue that it is an effective deterrent (威慑) to murder, while others maintain there is no convincing evidence that the death penalty reduces the number of murders.

The principal argument advanced by those opposed to the death penalty. basically, is that Lt is cruel and inhuman punishment, that it is the mark of a brutal society, and finally that it is of questionable effectiveness as a deterrent to crime anyway.

In our opinion, the death penalty is a necessary evil. Throughout recorded history there have always been those extreme individuals in every society who were capable of terribly violent crimes such-as murder. But some are more extreme than others.

For example, it is one thing to take the life of another in a fit of blind rage, but quite another to coldly plot and carry out the murder of one or more people in the style of a butcher. Thus, murder, like all other crimes, is a matter of relative degree. While it could be argued with some conviction that the criminal in the first instance should be merely isolated from society, such should not be the fate of the latter type murderer.

The value of the death penalty as a deterrent to crime may be open to debate. But the over whelming majority of citizens believe that the death penalty protects them. Their belief is reinforced by evidence which shows that the death penalty deters murder. For example, from 1954 to 1963, when the death penalty was consistently imposed in California, the murder rate remained between three and four murders for each 100000 population. Since 1964 the death penalty has been imposed only once, and the murder rate has risen to 10.4 murders for each 100000 population. The sharp climb in the state’s murder rate, which began when executions stopped, is no coincidence (巧合). It is convincing evidence that the death penalty does deter many murderers. If the bill reestablishing the death penalty is vetoed (否决), innocent people will be murdered— some whose lives may have been saved if the death penalty were in effect. This is literally a life or death matter. The lives of thousands of innocent people must be protected.

It can be inferred that the author thinks that ().

A. the veto of the bill reestablishing the death penalty is of little importance

B. the value of the death penalty as a deterrent to crime is not to be debated

C. the death penalty is the most controversial issue in the United States today

D. the second type murderers (in Para. 4) should be sentenced to death