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smoke damper
el.mach. 消烟设备
hydroel.st. 防烟阀
oil 烟道挡板
tech. 防烟挡板; 烟气调节风门; 烟气挡板; 烟道调节板
smoke damper: 13 phrases in 3 subjects
Metallurgy1
Refrigeration3
Technology9