原油一般都有那些性质?

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问题:

原油一般都有那些性质?

考点:防腐蚀工防腐蚀工题库
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证券市场的结构是指证券市场的构成及其各部分之间的量比关系,其中较为重要的结构有()。

A.层次结构

B.品种结构

C.多层次资本结构

D.交易场所结构

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肝素抗凝作用的特点是:

A.仅在体内有效

B.起效缓慢

C.体内体外均有效

D.口服有效

E.仅在体外有效

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电压互感器铁磁谐振的危害()。

A、开口三角出现电压,发生虚假接地;

B、可能烧毁电压互感器;

C、造成电网震荡;

D、高压电网能引起绝缘子闪络。

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At the time friends visit us in the evening, they often tell us they are in a hurry and look at their watches. It isn’t that our friends are all very busy; it is just that we haven’t got a television. People think that we are very strange. "But what do you do in the evening", they are always asking. The answer is very simple. Both my wife and I have hobbies. We certainly don’t spend our evenings looking at the walls. My wife enjoys cooking and painting and often attends evening classes in foreign languages. This is quite useful as we often go abroad for our holidays. I collect stamps and I’m always busy with my collection. Both of us enjoy listening to the music and playing chess together.

Sometimes there are power cuts and we have no electricity in the house. This does not worry us and we just light candles and carry on with what we were doing before. Our friends, however, are lost—no television! —So they don’t know what to do. On such evenings our house is very full for they all come to us. They all have a good time. Instead of sitting in silence in front of the television, everybody talks and plays games.

Both of them are interested in ().

A.learning languages

B.travelling

C.staying home alone

D.watching people play games

题型:问答题 简答题

绝对频率参考选择是以下那一个()

A、192.1THz

B、193.1THz

C、1550nm

D、1310nm

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