短语词组短语impulse type steam turbine 冲动式汽轮机multistage impulse steam turbine 多级冲击式汽轮机impulse -type steam turbine 冲动式汽轮机impulse train type steam turbine 冲动式汽轮机impulse interference wave steam turbine 冲动式汽轮机 返回 impulse steam turbine