组成核糖体的是()。 A.tRNA B.mRNA C.hnRNA D.snRNA E

题型:单项选择题 B1型题

问题:

组成核糖体的是()。

A.tRNA

B.mRNA

C.hnRNA

D.snRNA

E.rRNA

考点:病理学技术(士)分子生物学分子生物学题库
题型:单项选择题 B1型题

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 con sumers 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.

题型:单项选择题 B1型题
—_____ was your holiday, Jim?
—Wonderful!

A. What
B. How
C. Which
D. When
题型:单项选择题 B1型题

小明了解到用刻度尺测物体长度时会有一些因素引起测量误差,其中刻度尺的温度变化也是引起误差的原因之一.他想通过实验研究刻度尺长度随温度变化的情况.(4分)

(1)小明找来两把完全相同,长为20cm的钢尺,一把放在冰箱充分冷冻,一把放在阳光下长时间曝晒,再将两把钢尺互相测量,结果发现两把钢尺的长度几乎没有差异,请写出造成这种结果的原因(写出一条即可):___________________________________。

(2)他重新设计了如图所示的装置研究物体长度随温度变化的情况.装置中AB是粗细均匀的铜棒,COD是可绕O点转动的指针。实验时,A端固定不动,指针C端紧靠在铜棒B端,当用酒精灯给AB加热时,小明可以通过观察_______________分析金属棒受热时长度的变化.装置中指针设计成CO段比OD段短,这对实验现象起到了________作用.

(3)请你根据小明的实验提出一个值得探究的问题.

问题:_______________________________________________________。

题型:单项选择题 B1型题

实施共建“一带一路”倡议,发起创办(),设立丝路基金。

A.亚洲基础设施投资银行

B.非洲基础设施投资银行

C.全球基础设施投资银行

D.中国基础设施投资银行

题型:单项选择题 B1型题

三级安全教育是指()。

A.厂级

B.车间级

C.班组级

D.职工

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