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试述锅炉尾部烟道再燃烧的现象与处理方法。

答案

参考答案：

（一）现象：1.尾部烟道烟气温度及热风温度不正常地升高。2.炉膛和烟道负压剧烈变化。3.引风机轴封和烟道不严密处向外冒烟或喷火星，烟囱冒黑烟。4.严重时烟道防爆门爆破。

（二）处理方法：1.当发现尾部烟道烟气温度不正常地升高时，应首先查明原因，同时加强燃烧调整，对受热面进行蒸汽吹灰。2.经检查确为再燃烧时，应立即紧急停炉。汇报班长、值长。停止引、送风机，严密关闭各风门、挡板及烟道各孔门，密闭。3.开启尾部烟道蒸汽消防进行灭火。4.加强锅炉上水、放水，保护省煤器。5.待尾部烟道各段烟温正常后，方可打开检查孔检查。确认消灭火源后，可启动引风机进行通风。6.经检查设备未遭损坏时，汇报值长，重新点火启动恢复正常运行。

填空题

以下程序运行后的输出结果是_________。#include main(){char ch[]="abc",x[3][4]; int i; for(i=0;i<3;i++) strcpy(x[i],ch); for(i=0;i<3;i++) printf("%s",&x[i][i]); printf("\n"); }
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单项选择题

Of all the areas of learning the most important is the development of attitudes. Emotional reactions as well as logical thought processes affect the behavior of most people.
"The burnt child fears the fire" is one instance ; another is the rise of despots like Hitler. Both examples also point up the fact that attitudes stem from experience. In one case the experience was direct and impressive; in the other it was indirect and cumulative. The Nazis were indoctrinated largely by the speeches they heard and the books they read.
The classroom teacher in the elementary school is in a strategic position to influence attitudes. This is true partly because children acquire attitudes from those adults whose word they respect.

The author implies that ______.
A. the teacher should guide all discussions by revealing her own attitude
B. in some aspects of social studies a greater variety of methods can be used in the upper grades than in the lower grades
C. people usually act on the basis of reasoning rather than emotion
D. children’s attitudes often come from those of other children

Another reason it is true is that pupils often delve somewhat deeply into a subject in school that has only been touched upon at home or has possibly never occurred to them before. To a child who had previously acquired little knowledge of Mexico, his teacher’s method of handling such a unit would greatly affect his attitude toward Mexicans.
The media through which the teacher can develop wholesome attitudes are innumerable. Social studies (with special reference to races, creeds and nationalities) , science matters of health and safety, the very atmosphere of the classroom... these are a few of the fertile fields for the inculcation of proper emotional reactions.
However. when children come to school with undesirable attitudes, it is unwise for the teacher to attempt to change their feelings by cajoling or scolding them. She can achieve the proper effect by helping them obtain constructive experiences.
To illustrate, first grade pupils afraid of policemen will probably alter their attitudes after a classroom chat with the neighborhood officer in which he explains how he protects them. In the same way, a class of older children can develop attitudes through discussion, research, outside reading and all-day trips.
Finally, a teacher must constantly evaluate her own attitudes, because her influence can be deleterious if she has personal prejudices. This is especially true in respect to controversial issues and questions on which children should be encouraged to reach their own decisions as a result of objective analysis of all the facts.
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