prevent formation

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1.

As fluid is evacuated from the system or vessel , the vent valve must open to prevent formation of a vacuum .

当流体从系统或容器中排空时，排放阀必须打开以防止出现真空现象。

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2.

Prevent Formation in the First Place

首先要避免形成？

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3.

Study on drilling fluid for horizontal well to prevent formation damage in Minghuazhen formation, CB 243 block

埕北 243 区块明化镇组保护油层的水平井钻井液研究