短语词组短语rotary -vane attenuator 旋转翼片衰减器rotary y vane compressor 旋转叶压气机rotary sliding vane compressor 旋转式滑叶压缩机Rotary -vane Pump 旋片式机械真空泵rotary y vane motor 旋翼式电动机 返回 rotary vane