A two-stage compression variable frequency air source heat pump(TV-ASHP) has been developed combining variable frequency technology with two-stage compression cycle.是什么意思_A two-stage compression variable frequency air source heat pump(TV-ASHP) has been developed combining variable frequency technology with two-stage compression cycle.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句