例句 /

2X Series Rotary Vacuum Pumps is a basic equip-ment used for pumping air from sealedvessels to attain vacuum condition.

2X Series Rotary Vacuum Pumps is a basic equip-ment used for pumping air from sealedvessels to attain vacuum condition.

2X系列旋片式真空泵是用来对密封容器抽除气体而获得真空的基本设备。