更多“汽蚀余量是表示泵汽蚀性能的主要参数，用符号（）表示。”相关的问题
锅炉转杯式喷油器改变喷油量是靠改变（）。
A . A．进油压力
B . B．回油压力
C . C．进油流量
D . D．油杯转速
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汽轮机抽汽投入时，电负荷应≥（）KW。
A.5000
B.6000
C.6500
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从（）角度来看，需要完善网上商店订单处理流程。
A . 客户
B . 供应商
C . 经销商
D . 企业
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实体引用是指引用一个在实体声明中已经声明过的实体，那么在XML中对一般实体进行引用的形式为（）。
A.&实体名；
B.&实体名
C.%实体名；
D.%实体名
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Directions:In this section, there is one passage followed by 5 questions. Read the passage carefully, then answer the questions in as few words as possible (not more than 10 words). Remember to write the answers on the Answer Sheet. Questions 1-5 are based on the following passage. Many people today are worried about bird flu. They are afraid that it will pass from birds to humans and that thousands of people will die in a pandemic. In 1918 a flu virus killed about 50 million people around the world. The virus was called Spanish influenza (or Spanish flu, for short) because Spanish newspapers first described the disease. Now, after nine years of work, scientists in an American laboratory in Atlanta, Georgia, have produced a copy of the Spanish flu virus. They are also going to publish the genetic sequence of the virus on the Internet and some experts are afraid that other laboratories could copy the virus. Scientists have copied the virus because they want to understand why the 1918 Spanish flu pandemic killed so many people. In a report in the journal Science, Dr. Jeffery Taubenberger and a team of scientists in the USA show that the copied virus is extremely powerful. The scientists injected the virus into mice and the mice began to lose weight very quickly. They lost 13% of their weight in two days and all of the mice died within six days. “I didn’t expect it to be as lethal as it was,”Dr. Terrence Tumpey, one of the scientists in the team, told the journal Nature. In another experiment, they injected more mice with a normal type of flu. The mice lost weight at first but then they got better and did not die. The experiments showed that the mice with the Spanish flu virus had 39,000 times more flu virus in their bodies than the second group of mice. The scientists who copied the virus say their work has already provided important information about the virus and helps to explain why it is so lethal. But other experts are worried that the virus could escape from the laboratory. “Some people will think that they have really created a biological weapon,” said Professor Ronald Atlas of the University of Louisville in Kentucky. “I am even more worried now than I was before about the possibility of a flu pandemic. The 1918 flu pandemic started with bird flu and that might happen again today with Asian bird flu.” Some scientists are worried about the publication of the genetic sequence on the Internet. They are afraid that biologists could copy the virus using the information on the Internet. This could be very dangerous. It took a long time to copy the virus. Scientists used material taken from the lungs of people who died from the flu virus in 1918. In a second report in Nature, Taubenberger and his colleagues analyzed the genetic make-up of the virus. They were surprised to find that it was completely different from all the normal human flu viruses. This probably means that Spanish flu jumped from birds to humans and did not mix with a human virus first. This is very worrying for scientists because in the past everyone believed that a pandemic was only possible if a bird flu virus mixed with a human flu virus. Taubenberger says it is very important to know what changes in the virus caused the 1918 Spanish flu virus. This will help scientists to work out which viruses might cause a pandemic. The H5N1 bird flu in Asia is already changing and it could infect humans, he said. Viruses have escaped from high-security labs before. The SARS virus escaped at least twice, once in Taiwan and once in Singapore. But some scientists believe a pandemic will not happen even if the virus escapes, because most people are naturally immune and there are now a lot of drugs which protect people from flu. Questions: 1．When was the Spanish flu pandemic? 2．How many people died in the Spanish flu pandemic? 3．Where did the scientists produce a copy of the Spanish flu virus? 4．How quickly did the laboratory mice die? 5．What is H5N1?
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资产负债表表体部分反映资产、负债和所有者权益的内容。（ ）
A . 正确
B . 错误
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运用仿真模拟系统，可以集（）模块于一体，使学员循序渐进，迅速掌握多项专业技能。
A.理论； B.训练； C.考试； D.实操。
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A . 一个样本各观测值的分布B . 总体中各观测值的分布C . 样本统计量的分布D . 样本数量的分布
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下列比率指标中，属于反映企业发展能力的指标有( )。
A．资本积累率B．资产负债率C．总资产报酬率D．净资产收益率E．营业增长率
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在全套施工图设计完成并进行会审、交底后，由____直接组织施工的单位组织编制
A . 施工组织总设计
B . 一般初步设计
C . 技术设计
D . 扩大设计
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缓解时，模拟转换阀将排气阀打开，使气制动控制单元各阀中的预控压力为0。
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生物既能适应环境又能影响环境，下列能够说明生物适应环境的选项是（）。
A.蚁穴溃堤
B.青蛙冬眠
C.蚯蚓松土
D.大树底下好乘凉
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2岁6个月男孩，自周岁以后偏食，以牛奶、米粉及粥类为主食，很少进食鱼、肉、蛋类。近半年来常患感冒、肺炎等，食欲差，并有异食癖（捡食烟头等）。查体：体重9.5kg，身高82cm，皮肤粗糙，口唇略白，地图舌，有口腔溃疡，心肺无异常。腹软，肝肋下1cm。
77.该病儿可能的诊断是
A.营养性缺铁性贫血
B.营养不良
C.锌缺乏
D.免疫缺陷病
E.遗传代谢病
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题目内容
（请给出正确答案）
参考答案
十点题库官方参考答案
（由十点题库聘请的专业题库老师提供的解答）
