draft tubeとは意味:ドラフトチューブ、吸出管、循環(huán)チューブ draft tube meaning:[Mechanical engineering] The piping system for a reaction-type hydraulic turbine that allows the turbine to be set safely above tail water and yet utilize the full head of the site from head race to t...draft tube ?:phrase, (? ???) ???draft tube перевод:машиностр. труба отсасывающая