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重700N、底面积为7000cm2的圆柱体放置在1m2的水平桌面的中央, 则圆柱体底面受到的压强是_______，桌面受到的压强是_________；如果将此圆柱体水平切去一半，则桌面受到的压强是__________；若将此圆柱体竖直切去一半，对桌面的压强是___________。

答案

1000Pa；1000Pa；500Pa；1000Pa。

单项选择题

将狗的双侧肾上腺切除，当其出现症状后注射某种激素，接着测定随尿液排出的Na＋、K＋量，结果如图。注射的激素具有什么作用（）

A.减少钾的排出，促进钠的排出

B.促进钾的排出，促进钠的排出

C.促进钾的排出，减少钠的排出

D.减少钾的排出，减少钠的排出
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填空题

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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