单项选择题

关于电弧炉的种类及特点，属于不能设置电炉密封罩的电炉是（　　）

A.竖炉
B.Consteel炉
C.DanarcPlus2000炉
D.双壳电弧炉
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Read the article below about family businesses and the questions.For each question (13-18), mark one letter (A, B, C, or D) on your Answer Sheet.FAMILY BUSINESSESA great many people maybe at some stage in their lives consider setting up a business with their family members. The idea may seem very attractive, but the reality of working with someone close to you can often cause unforeseen problems. 80% of family-run businesses think that when times get tough, love, romance or family bonds will see them through. But the fact is that although 70% of businesses are family-run, only 40% of these companies survive to the second generation.Why do so many family businesses fail? While money has traditionally been thought to be the root of all difficulties, the major problem is much more clear. In businesses which don't have family ties or relationships, people find it easier to communicate and to say what is on their minD.In contrast, with family businesses, people often make the mistake of thinking they know what views other family members have without actually discussing with them.There is one strategy which should be used in all family businesses to protect potential problems. As time goes by, one partner may lose interest or not work as effectively as they are expected to. If each partner's responsibilities are identified from the start so that they know exactly what is required of them, difficulties are less likely to arise as the business develops. It is also recommended to ask yourselves a few 'what if' questions before starting a family business. For example, what if one of the partners brought a friend into the family business and others didn't like this person? What would you do? To avoid this kind of problem, you should talk it over amongst yourselves. This sort of research can make you aware of both your own attitudes and the attitudes of the other members of the family before problems actually occur.Contracts are another potential problems. Too many family businesses are run on the most informal terms. People often think it is unfriendly to ask a relative to sign a contract outlining the terms of a business venturE.But you should treat the family business like any other business and be professional to draw up a contract. Whether the business is profitable or not, it is supposed who owns the shares must be clearly defined and written into a formal contract. It must also be clear who is running the company. Some family businesses take a vote on every decision. Perhaps this exercise in democracy should be applauded, but it created so many complications that in the end the business faileD.Even a small committee can sometimes be too largE.In matters affecting the entire company. only one of you should be the decision-maker. He or she doesn't have to be the largest shareholder, but should be the one best able to lead the business.Another type of problem arises when a relative decides to join an already established business. In these cases, you should do everything you can to avoid favourism. It is important to avoid putting him straight into any kind of managerial position. Instead, encourage him to learn not only the company but the people who make it work by working on the shop floor on the assembly linE.They have to prove to be a valuable asset not to the family but to the business.Why do many people find it appealing to start a family business?A.Because there would be abundant capital for operation.B.Because family bonds are helpful in overcoming difficulties.C.Because they hope to survive for generations.D.Because they can make profits without unforeseen problems.
A.B.
C.
D.
E.
F.
G.
Why
H.Because
I.
B.Because
J.
C.Because
K.
D.Because
单项选择题
A铜业公司主要工艺设备有艾萨熔炼炉、电炉、余热锅炉等，艾萨熔炼炉产生的高温烟气进入余热锅炉，经热交换后产生蒸汽，热交换后的烟气经除尘净化系统处理后排放。余热锅炉设计额定蒸汽压力2.5MPa、额定蒸发量35t h、额定蒸汽温度350℃。2009年11月24日20时，当班调度甲昕到一声巨响，随即在监控系统屏幕上看到余热锅炉房有大量蒸汽喷出。甲按照应急救援预案要求立即拉响警报，通知紧急停炉和现场人员撤离，报告公司总经理乙。乙接报后，立即向上级有关部门报告，同时赶往现场指挥救援。21时，经人员清点，仍有5名职工下落不明，乙派2名工人进入现场查看情况，因现场蒸汽太大，2名工人被烫伤。于是紧急外调防护服，救援人员穿上防护服进入余热锅炉房，发现有4名职工死亡、1人重伤。事后查明，事故发生时余热锅炉的运行压力2.3MPa、蒸汽温度310℃，从熔炼炉到余热锅炉的冷却屏波纹金属软管爆裂，大量高温饱和蒸汽喷出，导致现场人员伤亡。此次事故的直接经济损失为420万元。[2010年真题改编]根据以上场景，回答下列问题该起事故的直接原因可能是（ ）
A.熔炼炉烟气温度过高
B.熔炼炉高温烟气压力过高
C.波纹金属软管质量不合格
D.现场职工未佩戴劳动防护用品
E.现场救援指挥人员失误
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