对车辆转向架侧架、摇枕实行寿命管理,凡使用年限超过( )年的配件全部报废。A.40

题型:单项选择题

问题:

对车辆转向架侧架、摇枕实行寿命管理,凡使用年限超过( )年的配件全部报废。

A.40
B.35
C.25
D.20

考点:安全工程师安全生产技术安全生产技术
题型:单项选择题

下列地点中,与诗句“坐地日行八万里,巡天遥看一千河”最接近的是(  )

A.10°N20°W

B.5°S60°E

C.50°N90°W

D.70°N120°E

题型:单项选择题

化学实验操作的规范性是实验成功的关键,同时也反映了实验者的化学素养。下列实验操作符合规范要求的是

A.在点燃氢气之前先检验氢气的纯度

B.用燃着的酒精灯引燃另一盏酒精灯

C.与滴瓶配套的胶头滴管使用完毕,清洗后放回原瓶

D.稀释浓硫酸时,将水沿玻璃棒慢慢注入浓硫酸中,并不断搅拌

题型:单项选择题

支原体与细菌的相同点是()

A.有细胞壁

B.含有核糖体

C.含有两种核酸

D.能在人工培养基上生长

E.细胞核无核膜及核仁,仅有核质

题型:单项选择题

Net Libray is a library that lends out digitalbooks. It treats a digital  like a  paperback copy. It charges libraries per book per copy and gives publishers a cut of  the total income.

From the consumer’s point of view,this means that if more than,Say, five people want the latest Danielle Steel romance novel,other people who request  that book will get a message saying the title can’t be found.

It’s a model many publishers seem to have embraced. More than 350 gave the  company rights to hand out their digital works,and McGraw-Hill Corporation and  Houghton Mifflin Corporation have put money in the company. The California public  libraries and about 1,800 others across the US are trying out the Net Library service.

Some librarians criticize the New Library model. Stanford  University librarian  Michael Keller argues that the company is creating an unnatural fear of digital woks,  which is contrary to the ideas of the Internet.

Kelle and some  other  librarians argue  for  the  e-book  vision  set forth by E-Brary. E-Brary is starting a service that lets us users read books for free.

But it will charge about 25 cents a page when a person tries to print out material or copy and paste it into a different file or tries to download copy onto a computer.

Christopher Warnock,chief executive of E-Brarw, believes most consumers won’t want to buy entire books,only the parts that interest them.

“There’s not really a lot of good in owning an electronic file and having to store it     and manage it.It doesn't make sense.”he said.

5.How do publishers get money from the Net Library?

A.They get money from selling their books to the Net Libary.

B.They share the money with the Net Library.

C.They get money by cutting the cost of the books.

D.They get the money from the readers.

6.The underlined word“embraced”in the 3rd paragraph means .      

A.taken something willingly                      B.held something tightly

C.disliked something badly                      D.tried out something hard

7.From the 2nd paragraph we can see consumers .      

A.don’t care if they are charged money

B.enjoy the service of the Net Library

C.don’t like other people borrowing books

D.complain about the limited number of the new books

8.What does the last paragraph mean?

A.Net Library is not a good way for the consumers.

B.There is no need for consumers to have a whole book.

C.EBrary is not a good library for the consumers.

D.It’s reasonable to charge the consumers money for copying some pages.

题型:单项选择题

下述外毒素的性质错误的是()

A.是细菌生长过程中合成并分泌到细胞外面的蛋白质

B.对组织的毒性有高度的选择性

C.可以用甲醛脱毒变成类毒素

D.易被理化因素灭活

E.外源性热原质,引起全身发热反应

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