天然超细BaSO4
natural supper fine BaSO 4
改进的硫酸钡重量法
improved barium sulfate gravimetric method
浓硫酸-硫酸银
sulfuricacid-silver sulfate
基于IPsec的VPN的应用
the application of virtual private network which is on the basis of IPsec
丙烯酰胺(丙烯酸)——天然橡胶接枝聚合物
AAM(AA)—natural rubber graft polymer
车辆用天然气加气系统
Natural Gas Refueling System for Vehicles
车用天然气
natural gas used for automobile
Vehicle-used Natural Gas
代用天然气(SNG)
characteristics of fractures
SNG
低含硫天然气
low sulfurious natural gas