... close addition of alloys 严格控制合金加入 close coiling 紧密盘管 close proximity 极为贴近 ...
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在这种情况下，需要紧密配合的阀来阻止夜间反向虹吸，以防止水在热交换器盘管中被冷冻。
In this case, tightly fitting dampers are required to prevent reverse thermosiphoning at night, which could freeze water in the heat exchanger coil.
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