人体内具有多项分化能力的最早的造血细胞是() A.红系祖细胞 B.造血干细胞 C.粒

题型:单项选择题

问题:

人体内具有多项分化能力的最早的造血细胞是()

A.红系祖细胞

B.造血干细胞

C.粒系祖细胞

D.巨核系祖细胞

E.T淋巴系祖细胞

考点:临床医学检验临床血液造血系统的基本理论造血系统的基本理论题库
题型:单项选择题

胡桃仁粥具有()功效。

A、润肠通便

B、补肾固精

C、滋肝补肾

D、温肺定喘

题型:单项选择题

为了减缓二氧化碳使全球变暖的趋势,有科学家提出大胆设想:将排放到空气中的二氧化碳压缩使其液化,然后将其压入到冰冷的海水中.但也有科学家担心海水中富含二氧化碳后酸度会增加,可能会杀死一些海洋生物,另外,把二氧化碳压入海底所消耗的能源可能再会增加二氧化碳的排放.

(1)二氧化碳使海水酸度增加的原理用化学方程式表示 _________

(2)二氧化碳在深海中的溶解度比在通常情况在水中的溶解度 _________ (填“大”或“小”),原因是 _________

(3)每位同学都应该有环保意识,请你提出一条具体的减少二氧化碳排放的措施_____

题型:单项选择题

外圆磨削时,工件产生直波形误差的主要原因是什么?

题型:单项选择题

阅读理解

     Taiwan police cannot decide whether to treat it as an extremely eleven act of stealing or an even

cleverer cheat  Either way , it could be the perfect crime, because the criminals are birds-horning pigeons !

     The crime begins with a telephone message to the owner of a stolen car : if you want the car back,

pay up then, the car owner is directed to a park, told where to find a bird cage and how to attach money

to the neck of the pigeon inside . Carrying the money in a tiny bag , the pigeon flies off .

     There have been at least four such pigeon pick-ups in Changwa. What at first seemed like the work

of a clever stay-at-home car thief, however , may in face be the work of an even lazier and more

inventive criminal mind-one that avoid not only colleting money but going out to steal the car in the first

place . Police officer Chen says that the criminal probably has pulled a double trick: he gets money for

things he cannot possibly return . Instead of stealing cars , he lets someone else do it and then waits for

the car-owner to place an ad. in the newspaper asking for help .

     The theory is supported by the fact that , so far , none of the stolen cars have been returned . Also,

the amount of money demanded-under 3,000 Taiwanese dollars -seems too little for a car worth many

times more .

     Demands for pigeon-delivered money stopped as soon as the press reported the story. And even if

they start again, Chen holds little hope of catching the criminal . "We have more important things to do, "

he said .

1. The "lazier and more inventive" criminal refers to          .

A. the car thief who stays at home      

B. one of those who put the ads in the paper

C. the owner of the pigeons        

D. one of the policemen in Changwa  

2. After the car owner received a phone call. He         

A. gave the money to the thief and had his car back in a park

B. sent some money to the thief by mail

C. told the press about it

D. went to a certain pigeon and put some money in the bag it carried

3 . The writer mentions the fact that "none of the stolen cars have been returned" to show      .

A. how easily people get fooled by criminals        

B. the thief is extremely clever                

C. the money paid is too little                    

D. what Chen thinks might be correct

4. We may infer from the text that the criminal knows how to reach the car owners because  __  .

A. he lives in the same neighborhood        

B. he has seen the car owners in the park

C. he reads the ads in the newspaper          

D. he has trained the pigeons to follow them

5. The underlined word "they" in the last paragraph refers to          .

A. criminals            

B. pigeons      

C. the stolen cars    

D. demands for money

题型:单项选择题

地籍要素测量的对象主要包括:()。

A.界址点、线以及其他重要的界标设施

B.行政区域和地籍区、地籍子区的界线

C.建筑物和永久性的构筑物

D.地类界和保护区的界线

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