三阀液压系统
three-valve hydraulic system
三氟甲烷灭火系统
trifluoro methane fire extinguishing system
三电系统
EIC system
Computer
electric drive and instrumentation system
三工位系统
three-directional beam delivery system
三管式供热系统
three pipe heat supply system
三滑移系统
Three directions slippage system