重力送料
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gravity feeding method 自流喂入法
Zero-gravity Feeding System 失重给料
semi-automatic gravity feeding 半自动重力送料
Contrast experiments between gravity feeding and direct expansion refrigeration system were carried on, performance characteristics difference of the two refrigeration systems were found out.
并与直接膨胀供液制冷系统做同工况下的对比实验，分析两种系统的工作特性差异。
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