如有必要可用干燥氮气置换反应器，并保压。
If necessarily, nitrogen dryer exchange reactor could be used with keeping presure.
氮气置换；
论述处置液化石油气汽车槽车事故使用氮气置换的必要性及氮气置换装置的组成、工作原理；
The paper expounds the necessity to use the nitrogen replaceable equipment in handling the problems with liquid-oil-gas-carrying tank cars by using nitrogen replaceable equipment;
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