结球生菜冷链流通保鲜的关键是预冷。
The key of keeping fresh lettuce under cold chain is pre-cooling.
其性能的优劣，直接关系到预冷的效果。
Its performance has a directly effect on pre-cooling results.
本研究对船舶实际航行中的预冷计划和节约预冷时间具有指导意义。
The conclusion and rule is helpful to precooling plan and saving time in the voyage.
本研究对船舶实际航行中的预冷计划和节约预冷时间具有指导意义。
The conclusion and rule is helpful to precooling plan and saving time in the voyage.
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