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换气次数
hydroel.st. air change time per hour
nautic., tech. air change ratio
railw. air changes
refrig. air circulation ratio; change of air
tech. air change rate; rate of air circulation; rate of ventilation; ventilation rate; number of air changes
换 气次数: 12 phrases in 4 subjects
Aviation1
Metallurgy1
Refrigeration3
Technology7

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