... 风道式通风 ventilation by air passage 隧道通风帘幕 ventilation curtain 列车活塞作用 piston action of train ...
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curtain for tunnel ventilation
...ation for tunnel;tunnel efflux ventilation;tunnel injector type ventilation 隧道通风帘幕 curtain for tunnel ventilation;ventilation curtain 通风设备 ventilation equipment ..
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