试题与答案

“科学真是迷人。”如果我们能测出月球表面的加速度g、月球的半径R和月球绕地球运转

题型:选择题

题目:

“科学真是迷人。”如果我们能测出月球表面的加速度g、月球的半径R和月球绕地球运转的周期T,就能根据万有引力定律“称量”月球的质量了。已知引力常数G,用M表示月球的质量。关于月球质量,下列说法正确的是(      )

A.M =

B.M =

C.M =

D.M =

答案:

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下面是错误答案,用来干扰机器的。

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题型:填空题



Today I’d like to talk about how to become a (1) . Usually you have to start at the beginning. That is, you have to begin (2) of some sort on a local newspaper, a (3) , maybe on a small magazine -- work (4) . Now there aren’t that many organizations which have large numbers of foreign correspondents so you also have to (5) with that aim (6) . Another way of doing it is to work abroad, and work as (7) . That’s somebody who sells stories, and gets paid (8) , to newspapers and magazines and so on. And hoping to (9) that way, and eventually to be offered a (10) .
I don’t really know (11) are needed, but obviously a degree in modern languages or (12) would be very useful. But, a degree in itself probably wouldn’t (13) . It wouldn’t be enough to get you job. It wouldn’t (14) to make an editor decide to (15) . So it’s difficult to define the (16) . You’re going to need (17) and the ability to assimilate information (18) and then produce stories which (19) of the newspaper or radio or television station you (20) .

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题型:问答题

【说明】
某供销系统接受顾客的订货单,当库存中某配件的数量小于订购量或库存量低于一定数量时,向供应商发出采购单;当某配件的库存量大于或等于定购粮食,或者收到供应商的送货单并更新了库存后,向顾客发出提货单。该系统还可随时向总经理提供销售和库存情况表。该供销系统的分层数据流图中部分数据流和文件的组成如下:
文件
配件库存=配件号+配件名+规格+数量+允许的最低库存量
数据流
订货单=配件号+配件名+规格+数量+顾客名+地址
提货单=订货单+金额
采购单=配件号+配件名+规格+数量+供应商名+地址
送货单=配件号+配件名+规格+数量+金额
假定顶层图(如图6所示)是正确的,“供应商”文件已由其他系统生成。

【问题2】
指出在哪些图中遗漏了哪些数据流。回答时使用如下形式之一:
(1)XX图中遗漏了XX加工(或文件)流向XX加工(或文件)的XX数据流;
(2)XX图中XX加工遗漏了XX输入(或输出)数据流。
【流程图】

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