But the so-called Massachusetts pump invented in USA in 1818 with straight radial blades, semi-open double suction impeller and volute is more close to the modern centrifugal pump.是什么意思_But the so-called Massachusetts pump invented in USA in 1818 with straight radial blades, semi-open double suction impeller and volute is more close to the modern centrifugal pump.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句