问题 问答题

某火力发电厂有6台额定压力13.72 MPa、额定蒸发量670 t/h的电站锅炉。为保证锅炉启动和稳定燃烧,建有2个500 m3的轻柴油储罐。为发电机冷却,建有制氢站。制氢站装有1套制氢设备和4个氢罐,氢罐的工作压力3.2 MPa、体积13.9 m3。在距制氢系统外部边界550 m处有一个汽油储罐区,有两个200 m3卧式汽油储罐,储罐的设计充装系数为0.85,两个汽油储罐在同一围堰内。
锅炉燃用煤粉由磨煤机加工后,经输粉管道直接进入炉膛。因生产需要,该厂决定对磨煤输粉系统进行改造。改造工程包括:拆除部分距离地面6 m高的破损输粉管道,更换新管道。在施工中,部分拆除和安装工作在脚手架上进行,使用额定起重量为5 t的电动葫芦。拆除旧管道时,使用乙炔进行气割。新管道焊接前,使用角磨机进行抛光。拆除的旧管道和其他旧设备使用叉车运走。施工现场周围有正在使用的动力电缆和高温管道,还有部分未清除的煤粉。
在企业年初会议上,总经理指出:安全检查是安全管理的重要内容,必须认真作好各项安全检查工作,最近企业组织了两次安全检查,在检查结束不久,该企业工作人员因设备维修结束后,不慎从6米处坠落。安监部门在认真查找各个环节时发现大部分车间没有按照要求制定安全检查表,没有落实检查责任,上报问题基本都是设备缺陷,安全检查工作事实上已经流于形式。面对这样的结果,该企业安监部门负责人陷入深思。
相关资料:所用汽油的密度为750 kg/m3,标准《重大危险源辨识》(GB 18218)中给出:汽油临界量为200吨。
根据以上场景,回答下列问题

根据《企业职工伤亡事故分类标准》的规定,说明该施工现场可能发生的事故类型及其发生因素。

答案

参考答案:(1)物体打击:高空落物;
(2)车辆伤害:叉车;
(3)起重伤害:电动葫芦、倒链;
(4)触电:电焊、角磨机、运行中的电缆;
(5)灼烫:高温管道、电焊、气割;
(6)火灾:焊渣、煤粉及其他可燃物;
(7)高处坠落:高空作业;
(8)容器爆炸:氧气瓶(罐)、乙炔气瓶(罐);
(9)机械伤害:角磨机;
(10)锅炉爆炸:锅炉;
(11)其他爆炸:煤粉。

单项选择题
填空题

At Columbia University, where I taught economics for many years before coming to China, most of my students spent a great deal of time in volunteer work. They taught poor children in the local neighborhoods, they visited the elderly in hospitals and at home and helped them with their shopping, they worked to preserve historic sites and places of beauty, they cleaned up waste dumps, they prepared food for the hungry, they created and ran student newspapers, they organized concerts and artistic events, they acted as translators for migrant workers, they formed political pressure groups, they raised money to combat AIDS, malaria, and other diseases, and so on.
As part 0f that tradition I do volunteer work here in Beijing, just as I did in New York, but I find that my students at Tsinghua University and at other schools in Beijing are much less involved in volunteering then I had expected; In part, of course, this reflects the heavier workload in Chinese schools, which leaves less time for outside activities. But I think there is more to it than just this. I think it also reflects a very different system, in which volunteer work for students here is usually organized or sponsored by government, schools, or other official groups, rather than by the students themselves. (41) .
This is unfortunate. I think it would be better both for them and for society if Chinese students took the initiative to decide what kinds of problems or issues they felt to be of importance, and then played a more active role in organizing the work. (42) .
But there are at least two other important reasons for doing volunteer work. The first is that you can learn a lot about yourself and about your abilities by organizing, taking on responsibilities, deciding on objectives, and fulfilling them. (43) .
This is an important lesson. Many of my students here work very hard, but their attitude towards their work is not always a healthy one. They do the work not because they love it or feel that it is exciting but rather because it is expected of them, and they will get rewarded (or at least not punished) if they do it. With charitable work there is no explicit reward. You work because you have goals, and in the end the only judge of your work is yourself. (44) . It also forces you to think about what you are doing and the best way to accomplish your objectives. You are no longer simply doing something because your teacher or your boss told you to do it.
The second important reason for charitable work is that it changes your relationship with your society. Sometimes I feel that many of the people I meet here don’t really appreciate the greatness of China and the excitement of the process through which it is currently living. The Chinese are well-known for being nationalistic, but sometimes I think this nationalism has more to do with distrust of foreigners than with love of country. Many of my friends and students simply do not know very much about their own country, and often seem unhappy with or embarrassed by certain aspects of China.
(45) . For example, if you help the children of migrant workers with their education, you will quickly realize that poor migrant workers should not be seen as an embarrassment to Beijing. On the contrary, they are a great strength, and their stories are part of a huge and dramatic experiment that China is undergoing. In a small way by working with migrant children you can help make the experiment a success.
[A] I think that if they had spent more time engaged in activities outside of school and family such as doing volunteer work, they would feel very differently.
[B] This changes the way you think about work and about your responsibilities to yourself and others.
[C] You will realize how future events can have just as Big an impact on your life and those of your friends and family.
[D] This means that many students here in Beijing think of volunteering as something that must be done to please teachers, bosses, or other figures of authority, rather than because of a desire to address a problem about which they have thought very deeply.
[E] When you work closely with others who are less fortunate than you, or when you set a local goal and work to accomplish it, you see directly how your actions can affect the world around you.
[F] If you are interested in volunteer work you don’t have to wait for your school, your teachers, or officials on television to tell you what to do.
[G] There are many reasons why this would be good. The most obvious reason, of course, is that we all have obligations towards our society, and volunteer work is one way of repaying this obligation.