PSA进料量增大应适当延长吸附时间,进料量减小应适当的缩短吸附时间。

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问题:

PSA进料量增大应适当延长吸附时间,进料量减小应适当的缩短吸附时间。

考点:制氢装置工程师制氢装置工程师题库
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请简述麻醉前检诊的目的。

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许多轿车后窗玻璃做成双层并且都平行地粘有若干条薄膜,薄膜通电后可以(  )

A.加热取暖

B.不让车外的行人看见车内的乘客

C.防止后窗集灰

D.消除附在车窗玻璃上的小水珠

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For most people, shopping is still a matter of wandering down the street or loading a cart in a shopping mall.Soon, that will change.Electronic commerce (trade) is growing fast and will soon bring people more choices.There will, however, be a cost: protecting the consumer from being cheated will be harder.Many governments therefore want to apply street regulations to the electronic world.But politicians would be wiser to see cyberspace as a basis for a new era of corporate self-regulation.

Consumers in rich countries have grown used to the idea that the government takes responsibility for everything for the stability of the banks to the safety of the drugs or their rights to refund when goods are faulty.But governments cannot enforce national laws on businesses whose only presence is on the screen.Even in a country where a clear right to compensation exists, the on-line customer in Tokyo, say, can hardly go to New York to get a refund for a clothes purchase.

One answer is for government to cooperate more: to recognize each other’s  rules.But that requires years of work and volumes of detailed rules.And plenty of countries have rules too fanciful for sober countries to accept.There is, however, another choice.Let the electronic businesses do the regulation themselves.They do, after all, have a self-interest in doing so.

In electronic commerce, a reputation for honest dealing will be a valuable competitive asset.Governments, too, may compete to be trusted.For instance, customers ordering medicines on-line may prefer to buy from the United States because they trust the rigorous screening of the Food and Drug Administration; or they may decide that the FDA’s rules are too strict, and buy from Switzerland instead.

Customers will still need to use their judgment.But precisely because the technology is new, electronic shoppers are likely for a while to be a lot more cautious than customers of the normal sort.And the new technology will also make it easier for them to complain when a company lets them down.In this way, at least, the advent of cyberspace may argue for fewer consumer protection laws, not more.

小题1:According to the author, what will be the best policy for electronic commerce?

A.Self-regulation by the business.

B.Strict consumer protection laws.

C.Close international cooperation.

D.Government protection.小题2:In case an electronic shopper bought faulty goods from a foreign country, what could he do?

A.Refuse to pay for the purchase.

B.Go to the seller and ask for a refund.

C.Appeal to consumer protection law.

D.Complain about it on the Internet.小题3:In the author’s view, businesses would place a high emphasis on honest dealing because in the electronic world _________________________________.

A.international cooperation would be much more frequent

B.consumers could easily seek government protection

C.a good reputation is a great advantage in competition

D.it would be easy for consumers to complain小题4:We can infer from the passage that in licensing new drugs the FDA in the United States is ____________________.

A.very quick

B.very cautious

C.very slow

D.rather careless小题5:If a customer buys something that does not meet his expectation, what is the advantage of dealing through electronic commerce over the present normal one?

A.It will be easier for him to return the goods he is not satisfied with.

B.It will be easier for him to attain the refund from the seller.

C.It will be easier for him to get his complaints heard by other consumers.

D.It will be easier for him to complain about this to the government.

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黑变病的发生和下列哪些有关()

A.与缺乏维生素有关

B.与焦油接触有关

C.是一种光敏性皮炎

D.可累及上胸和臂部

题型:判断题

我国西部第一家世界500强的企业是()

A.延长石油集团

B.长虹电子集团

C.陕煤化

D.神府煤田

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