每一种用来控制水锤撞击的装置都需要置换规定数量立方英尺的容积。

A prescribed amount of cubic inch displacement is required for each type of device intended for the control of shock.

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介绍城市煤气输配系统置换方式的选择、置换参数的确定、置换工艺流程及指标的控制，说明直接置换方式的可靠性。

The article introduces choices of direct purge on gas transmission system displacement method, determination of purge criteria, its technological process and control, then its reliability.

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最初大家都只知道它的序列很短，是极其微小的RNA控制片断，大家叫它为反义RNA，它通过置换作用而阻止抑制基因的活性，从而阻碍密码子的转录与翻译活动。

It was previously known that short, tiny control RNA, called antisense RNA, can stop the activity of genes by placing themselves so that "reading" of the code is impeded.

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