一圆形建筑物半径为27.5m,若测量半径的误差为±1cm,则圆面积的中误差为( )

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问题:

一圆形建筑物半径为27.5m,若测量半径的误差为±1cm,则圆面积的中误差为( )。

A.±1.77m2

B.±1.73m2

C.±1.76m2

D.±1.74m2

考点:注册公用设备工程师给水排水专业勘察设计注册公用设备工程师给水排水专业基础
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慧眼辨真伪(找出每组词语中的错字,并改正)。

1.A.沙窗   B.牛蛙   C.灯笼  _____(  )

2.A.隔壁   B.衬脱   C.皎洁  _____(  )

3.A.浮现   B.姿态   C.洗藻  _____(  )

4.A.胸怀   B.溅起   C.朝声  _____(  )

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女,27岁,产后半月,右 * * 胀痛伴高热38.5℃,体检:右 * * 外上象限明显红肿,无触痛,无波动感,诊断为急性乳腺炎。

急性乳腺炎的常见原因是()。

A.细菌侵入

B.乳管通畅

C.乳汁分泌过多

D.哺乳期长

E. * * 皲裂

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房屋租赁合同是()。

A.要式合同

B.不要式合同

C.主合同

D.从合同

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下面说法中,错误的是______。

A.文本型字段,最长为 255 个字符

B.要得到一个计算字段的结果,仅能运用总计查询来完成

C.在创建一对一关系时,要求两个表的相关字段都是主关键字

D.创建表之间的关系时,正确的操作是关闭所有打开的表

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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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