火炬正常燃烧时,分子封氮气应该关闭。

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问题:

火炬正常燃烧时,分子封氮气应该关闭。

考点:乙烯装置操作工乙烯装置操作工题库
题型:判断题

For over one hundred and fifty years, Americans of all social classes have worn blue jeans.  61 Whether they are worn for work or for fashion today.Strauss' invention continues to be popular not only among Americans but also among people around the world.

Levi Strauss was born in Germany in 1829.  62 He grew up in Kentucky before moving to New York in 1847.Before becoming an American citizen and moving to the West in 1853, Strauss worked in his brother's dry goods business.This gave him a chance to produce his famous invention.After the gold rush of 1949, Strauss decided to move to the West to seek his fortunes.

Strauss did not want to be a person who searched an area for minerals.Instead, he knew he could make a good living by selling supplies to the miners.At first, he planned to sell sewing supplies and cloth.63 When he heard miners complaining that their clothes were easily broken or they usually tore their pockets during mining, he decided to use a special fabric to make pants for the miners.These pants proved so popular that he quickly ran out of materials to make more.

In 1873, Strauss received a letter from a Jewish tailor named Jacob Davis who had invented a process of connecting pockets with copper rivets(铆钉).This made the pants last a long time.Because Davis did not have the money to patent his idea, he offered to share it with Strauss if Strauss would agree to pay for the patent.  64  

By the time Strauss died in 1902, he had made a great contribution to American fashion.

65  The business has been growing ever since and Levi Strauss' company is now one of the largest clothing companies in the world.

A.As a young boy, he moved with his family to the United States.

B.Nobody knew what kind of material was suitable.

C.He did and Levi jeans have been made with metal rivets ever since.

D.However, he did not get much business for those products.E.He also made a great contribution to America's clothing industry.

F.Since they were invented by Levi Strauss, they have become a symbol of American consumer culture.

G.As the business grew, Strauss got much money from it.

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如果用混凝土梁替代钢梁,对上述事故的避免有无好处?为什么?若仍采用钢梁,可采用哪些构造措施来避免上述事故的发生?(3分)

题型:判断题

我国首个北极科学考察站是中国北极()。

A、黄河站

B、长江站

C、长城站

D、中山站

题型:判断题

某企业于2010年11月接受一项产品安装业务,采用完工百分比法确认劳务收入,预计安装期14个月,合同总收入200万元,合同预计总成本为158万元。至2011年底已预收款项160万元,余款在安装完成时收回,至2011年12月31日实际发生成本152万元,预计还将发生成本8万元。2010年已确认收入60万元。假定该企业采用累计实际发生的成本占合同预计总成本的比例确定完工进度,则该企业2011年度确认的收入为( )万元。

A.190
B.200
C.130
D.140

题型:判断题

下列关于急性病毒性心肌炎的诊断要点,错误的是:()

A.在上呼吸道感染、腹泻等病毒感染后1~3周内或急性期中出现心脏表现(如舒张期奔马律、心包摩擦音、心脏扩大)及(或)充血性心力衰竭或阿-斯综合征者

B.上呼吸道感染、腹泻等感染后1~3周内或发病同时新出现的各种心律失常,而在未服抗心律失常药前可出现下列心电图改变者:传导阻滞、ST-T改变、室上性或室性心律失常

C.明确病原学检查

D.排除甲状腺功能亢进、β-受体功能亢进症及影响心肌的其他疾患

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