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问题 填空题

如图所示，两根弹簧原长都是100cm，劲度系数都是k=10N/m，小球A和B的质量都是100g，若不计弹簧质量，而且两个小球都可看做质点，则悬点O到B之间的弹簧总长度是______（g=10N/kg）

答案

对两球组成的整体分析有：2mg=k△xA，

对下面小球受力分析，有：mg=k△xB，

L=△xA+△xB+2l0

代入数据得：L=230cm

故答案为：230cm．

单项选择题

保险公估人员进行账务审核时，应在第一时间内取得并查看（）。

A.出险单位的会计账册和有关凭证

B.损余物资处理方案

C.保险财产损失鉴定表

D.与出险标的有关的各种证明材料
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单项选择题

It is difficult to imagine what life would be like without memory. The meanings of thousands of everyday perceptions, the bases (51) the decisions we make, an d the roots of our habits and skills are to be (52) in our past experiences, which are brought into the present (53) memory.

Memory can be defined as the capacity to keep (54) available for later use. It includes not only "remembering" things like arithmetic or historical facts, but also any change in the way an animal typically behaves. Memory is (55) when a rat gives up eating grain because he has sniffed something suspicious in the grain pile. Memory is also involved when a six-year-old child learns to swing a baseball bat.

Memory (56) not only in humans and animals but also in some physical objects and machines. Computers, for example, contain devices for storing data for later use. It is interesting to compare the memory-storage capacity of a computer (57) that of a human being. The instant-access memory of a large computer may hold up to 100000 "words" —ready for (58) use. An average American teenager probably recognizes the meanings of about 100000 words of English. However, this is but a fraction of the total (59) of information which the teenager has stored. Consider, for example, the number of facts and places that the teenager can recognize on sight. The use of words is the basis of the advanced problem-solving intelligence of human beings. A large part of a person’s memory is in terms of words and (60) of words.

60().

A. combinations

B. connections

C. co-ordinations

D. collections
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