()用来极化核磁矩。A、静磁场B0 B、动态磁场B1 C、自旋磁场Bl D、自旋磁场

题型:单项选择题

问题:

()用来极化核磁矩。

A、静磁场B0

B、动态磁场B1

C、自旋磁场Bl

D、自旋磁场B0

考点:测井工考试测井工高级技师测井工高级技师题库
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关于阵发性夜间呼吸困难发生的可能机制,下列哪一项是错误的

A.入睡时迷走神经兴奋性增高,小支气管收缩,影响肺泡通气

B.卧位时膈肌上抬,肺活量减少

C.卧床后,左室不能承受回流增多的血量,左室舒张末压升高

D.由于夜间心动过缓引起

E.熟睡时呼吸中枢敏感性降低

题型:单项选择题

短期融资券、中期票据筹资的优点主要有()。

A.融资成本低

B.发行门槛较低

C.能提高企业信誉和提升企业形象

D.期限短

E.便利快捷

题型:单项选择题

阅读理解

    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 strict regulations to the electronic world. But  politicians would be

wiser to see cyberspace as a basis for a new era of corporate selfregulation.

    Consumers in rich countries have grown used to the idea that the government takes responsibility for

everything from 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 online 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 selfinterest 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 online 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 l

east,the advent of cyberspace may argue for fewer consumer protection laws,not more.

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

A.Selfregulation by the businesses.

B.Strict consumer protection laws.

C.Close international cooperation.

D.Government protection

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.

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

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

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.

题型:单项选择题

女,32岁,自觉下前牙松动半年余。检查:全口牙龈呈鲜红色,光亮,质松软,下前牙牙周袋5~6mm,龈上石(++),松动度Ⅱ度,X线片显示下前牙牙槽嵴水平吸收达根长1/3。最可能的诊断是

A.慢性牙龈炎

B.成人牙周炎

C.急性牙龈炎

D.青少年牙周炎

E.牙周脓肿

题型:单项选择题

小强接到电话,对方称他的快递没有及时领取,请联系XXXX电话,小强拨打该电话后提供自己的私人信息后,对方告知小强并没有快递。过了一个月之后,小强的多个账号都无法登录。在这个事件当中,请问小强最有可能遇到的情况可能是:()。

A、快递信息错误而已,小强网站账号丢失与快递这件事情无关

B、小强遭到了社会工程学诈骗,得到小强的信息从而反推出各种网站的账号密码

C、小强遭到了电话诈骗,想欺骗小强财产

D、小强的多个网站账号使用了弱口令,所以被盗

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