四气门汽油机
4-valves SI engine
valve gasoline engine
four-valve gasoline engine
4-valve gasoline engine
valve SI engine
四卷筒电气差动控制系统
four-drum electrical differential control system
四极残余气体分析仪
quadrupole residual gas analyser
四极残气分析仪
quadrupole residual-gas analyzer
四丁基氢氧气化铵溶液
tetrabutylammonium hydroxide solution
四川石油管理局天然气研究所
Institute of Natural Gas of Sichuan Petroleum Administration
四川省气象台；成都高原气象研究所
SiChuan Meteorological Observatory
sichuan provincial meteorological office
2 Chengdu Institute of Plateau Meteorology
Chengdu 610072