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问题 单项选择题

由闸瓦压紧车轮踏面开始产生制动力时起到列车停止运行时止，列车所走行的距离叫（）。

A、有效制动距离

B、无效制动距离

C、制动距离

D、缓解距离

答案

参考答案：A

填空题

档案信息数字化的内容有：档案目录信息的数字化和（）。
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单项选择题

For many years, the principle goal of computer (73) was to write short pieces of code that would execute quickly. The (74) needed to be small, because memory was expensive, and it needed to be fast ,because processing power was also expensive.

A．users

B．programmers

C．computer

D．program
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