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分析了冻结物冷藏间中“下进上出”式“Ｕ”型顶排管氨泵供液系统存在的问题，提出了针对性的改进措施。
The problems existing in the liquid supply system of the “bottom-in-top-out” U-type top-row pipe ammonia pump in the refrigerated area of freezing ware were analyzed, and the corresponding improvement measures were put forward.