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问题 不定项选择

1991年5月11日的《北京晚报》曾报道了这样一则动人的事迹：5月9日下午，一位4岁小男孩从高15层的楼顶坠下，被同楼的一位青年在楼下接住，幸免于难。设每层楼的高度为3 m，这位青年从他所在的地方冲到楼下需要的时间是1.3s，则该青年要接住孩子，至多允许他反应的时间是（g取10m/s2）[ ]

A．3.0 s

B．1.7s

C．0.4s

D．1.3s

答案

答案：B

单项选择题

(71) analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the (72) for designing and constructing an improved system. (73) is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called (74) . (75) is another such technique that integrates data and process concerns into constructs called objects.

（75）是（）

A. Structured analysis

B. Information Engineering

C. Discovery Prototyping

D. Object-Oriented analysis
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单项选择题

牵出线股道容车数按有效长减去调车机车长度和（）安全附加距离后，分别除以11.0m和14.3m计算。

A、30m

B、20m

C、10m
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