通信网的基本结构形式有五种,分别是()、星型、()、环型、总线型。

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通信网的基本结构形式有五种,分别是()、星型、()、环型、总线型。

考点:传输线路维护人员考试光缆线路维护光缆线路维护题库
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以相同的执行价格同时卖出看涨期权和看跌期权,属于( )。

A.买入跨式套利
B.卖出跨式套利
C.买入宽跨式套利
D.卖出宽跨式套利

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Rumour(谣言)is the most primitive way of spreading stories--- by passing them on from mouth to mouth. but civilized countries in normal times have better sources  of news than rumour. They have radio, television, and newspapers. In times of confusion(混乱), however, rumour appears and becomes widespread. At such times the different kinds of news are in competition: the press, television, and radio against the grapevine.

Especially do rumours spread when war requires control on many important matters. The normal news sources no longer give out enough information. Since the people can not learn through legal channels all that they are anxious to learn, they pick up "news" wherever they can and when this happens, rumour grows.

Rumours are often repeated even by those who do not believe the tales. There is an interest about them. The reason is that the cleverly designed rumour gives expression to something  deep in the hearts of the victims --- the fears, doubts, forbidden hopes, or daydreams which they hesitate to voice directly. Pessimistic(悲观的)rumours about defeat and disasters show that the people who repeat them are worried and anxious .Optimistic rumours about record production or peace soon coming point to self- satisfaction or confidence---and often to over- confidence.

小题1:The author suggests that, in times of confusion, man often __________.

A.stops regular news services

B.turns to primitive ways for support

C.distrusts his fellow man

D.loses complete control of himself小题2:The underlined word "grapevine" in Paragraph 1 probably means "__________”.

A.rumour

B.newspaper

C.information

D.time小题3:The author states that during wartime the regular sources of news provide only __________ .

A.false information

B.optimistic reports

C.limited information

D.pessimistic reports小题4:Which of the following statements is mentioned as a reason for people to repeat a rumour?

A.They are too willing to believe.

B.They take an interest in rumour.

C.They have a strong desire to make a fool of other people.

D.They find some rumours reflect their own unexpressed beliefs.

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用于肿瘤筛查对肿瘤标志物的要求是( )

A.特异性高
B.敏感性高
C.精密度高
D.测定范围宽
E.以上都是

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中国文化崇尚和平的表现有()。

A.反对穷兵黩武

B.反对不义之战

C.静定不争

D.重文轻武

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即使知道加密方法,也不一定知道如何解密。

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