... 直接倾倒：direct dumping 直接空气供热系统：direct air heating system 直接进货价：Direct import prices ...
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Owing to the complexity of the structure and the system of the new direct air-cooled heating units, a new question is arised about how to heating economically under operating condition.
新型直冷供热机组由于结构和系统的复杂性，其如何在供热工况下经济运行成为新的课题。
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