Packing: Teflon or graphite packing protected from low temperatures by a column of insulating gas.
Packing: Teflon or graphite packing protected from low temperatures by a column of insulating gas.
填料：通过保温绝缘气体来保护聚四氟乙烯或石墨免受低温影响。
Packing: Teflon or graphite packing protected from low temperatures by a column of insulating gas.
填料：通过保温绝缘气体来保护聚四氟乙烯或石墨免受低温影响。