This system combines a highly insulated cooler with a liquid nitrogen reservoir so to maintain temperature sensitive samples at vapor phase temperatures.
该冷却器高度绝缘，带有液氮容器，保持样品的气相温度。
The main reservoir of nitrogen is the atmosphere .
氮的主要蓄存库是大气层。
In view of reservoir properties and development characteristics in Oubei block of Jiangsu Oilfield, a numerical simulation model of gravity drive of crestal nitrogen injection was established.
针对江苏油田欧北区块的地质条件和开发现状，建立了顶部注氮气重力驱数值模型。
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