我国冬季气温分布的特点是( ) A.北高南低 B.南北温差大 C.全国普遍寒冷

题型:选择题

问题:

我国冬季气温分布的特点是(  )

A.北高南低

B.南北温差大

C.全国普遍寒冷

D.南北温差小

考点:中国的气候,季风
题型:选择题
解方程(1)x2-2x-l=0    (2) 
x
x-1
-
2x-2
x
-1=0
题型:选择题

串联电抗器可用来抑制谐波,当电容器接入电网处的背景谐波为5次及以上时电抗率宜取( )。

A.4.5%~6%

B.12%

C.4.5%~5%

D.5%~8%

题型:选择题

Whether you’re eating at a fancy restaurant or dining in someone’s home. Proper table manners are likely to help you make a good impression. According to a US expert, Emily Post, “All rules of table manners are made to avoid ugliness.”

While Henry Hitchings of the Los Angeles Times admits that good manners can reduce social conflict, he points out that mostly their purpose is protective - they turn our natural warrior-like selves into more elegant ones.

So where did table manners come from?

In medieval England, a writer named Petrus Alfonsi took the lead to urge people not to speak with their mouths full. And King David I of Scotland also proposed that any of his people who learned to eat more neatly be given a tax deduction (减除).

Disappointingly, that idea never caught on. It was during the Renaissance, when there were real technical developments, opinions of correct behavior changed for good. “None of these was more significant than the introduction of the table fork,” wrote Hitchings. “Gradually, as forks became popular, they brought the new way of eating, making it possible, for instance, to consume berries without making one’s fingers dirty.”

Forks were introduced to Britain in 1608 and 25 years later, the first table fork reached America. Yet while most of the essentials (基本要素) are the same on both sides of the Atlantic, there are a few clear differences between what’s normal in the US and what holds true in the UK. For example, in the US, when food needs cutting with a knife, people generally cut a bite, then lay aside the knife and switch the fork to their right hand. Then they pick up one bite at a time. By contrast, Britons keep the fork in the left hand and don’t lay the knife down.

Though globalization has developed a new, simpler international standard of table manners, some people still stick with the American cut-and-switch method.The Los Angeles Times noted, “They are hanging on to a form of behavior that favors manners above efficiency.”

小题1:What does the story mainly talk about?

A.The importance of proper table manners .

B.The development of table manners in Western countries.

C.Some unwritten rules of table manners in the US and UK.

D.Differences between American and British table manners.小题2:The underlined phrase “caught on” in the passage probably means ______.

A.worked in practice

B.became popular

C.drew attention

D.had a positive effect小题3:Which of the following events influenced people’s table manners most according to the article?

A.The introduction of forks.

B.The tax deduction policy.

C.The rise of the Renaissance.

D.Petrus Alfonsi’s efforts in promoting table manners.小题4:What can we conclude from the article?

A.British and American table manners are completely different from each other.

B.American people pay more attention to their table manners than British people do.

C.With globalization, the American cut-and-switch method has been abandoned in the US.

D.British people’s way of using a knife and fork may be more efficient than American people’s.

题型:选择题

乙胺丁醇主要不良反应为()

A.末梢神经炎

B.胃肠道不适

C.肝损害

D.听力障碍

E.球后视神经炎

题型:选择题

转盘扭矩增大,钻具上提下放遇阻,泵压上升,井口流量减小,其井下复杂情况为()。

A、井塌

B、砂桥

C、缩径

D、溢流

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