利用导电性能比金属差,比非金属强的材料可制成二极管和三极管等电子元件:科学家发现

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问题:

利用导电性能比金属差,比非金属强的        材料可制成二极管和三极管等电子元件:科学家发现某些物质在温度非常低时电阻变成了       ,这就是超导现象;在发电、传输和贮存电力方面,使用超导材料可以减少       损失。

考点:压强的大小及其计算光的反射规律及其应用水的三态变化
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工程项目总投资由建设投资、建设期利息和( )构成。

A.生产准备费

B.基本预备费

C.工程保险费

D.流动资金

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In the following passage, there are 25 blanks representing words that are missing from the context. You are to put back in each of the blanks the missing word. Write your answers on the ANSWER SHEET. The time for this section is 25 minutes.
Some consumer researchers distinguish (1) "rational" motives and "emotional" (or "non-rational") motives. They use the term "rationality" (2) the traditional economic sense that assumes (3) consumers behave rationally when they carefully consider all alternatives (4) choose those that give them the greatest utility (i.e., satisfaction). (5) a marketing context, the term "rationality" implies that the consumer selects goods based (6) totally objective criteria, such (7) size, weight, price, and so on. "Emotional" motives imply the selection of goods (8) to personal or subjective criteria—the desire (9) individuality, pride, fear, affection or status.
The assumption underlying this distinction is (10) subjective or emotional criteria do not maximize utility or satisfaction. (11) , it is reasonable to assume that consumers always attempt to select alternatives that, (12) their view, serve to maximize satisfaction. Obviously, the assessment of satisfaction is a very personal process, based (13) the individual’s own needs as (14) as on past behavioral, social, and learning experiences. What may appear (15) irrational to an outside observer may be perfectly rational (16) the context of the consumer’s own psychological field. For example, a product purchased to enhance one’s self-image (such as a fragrance) is a perfectly rational form of consumer behavior. (17) behavior did not appear rational to the person who undertakes it (18) the time that it is undertaken, obviously he or she would not do it. (19) the distinction between rational and emotional motives does not appear to be warranted.
Some researchers go so far (20) to suggest that emphasis (21) "needs" obscures the rational, or conscious, nature of most consumer motivation. They claim that consumers act consciously (22) maximize their gains and minimize their losses; that they act not (23) subconscious drives but from rational preferences, (24) what they perceive to be (25) their own best interests.

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从患者或模体向外延伸后的剂量计算区域称为()

A.剂量外延

B.剂量热区

C.延伸模体

D.模体外延

E.模体热区

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小型隔爆电器127V时绝缘不低于()MΩ.

A.5

B.2

C.1

D.O.5

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“得诸见闻,班班可纪”中的“纪”意思是()

A.纲纪

B.纪念

C.通"记"

D.记得

E.回忆

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