Vacuum technology; acceptance specifications for diffusions pumps and vapour jet vacuum pumps for vapour pressures of the pump fluid 1 mbar是什么意思_Vacuum technology; acceptance specifications for diffusions pumps and vapour jet vacuum pumps for vapour pressures of the pump fluid 1 mbar在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句