vacuum tightness 真空密封度 ; 真空度 ; 真空密闭性 ; 真空紧密度
Vacuum tightness of optimal value 真空严密性最优值
vacuum tightness test 真空系统严密性试验
thermal system vacuum tightness 真空严密性试验
tightness of vacuum system 真空系统严密性
tightness inspection of vacuum system 真空系统严密性检查
vacuum system tightness 真空系统严密性
vacuum sealvacuum tightness 真空密闭
Vacuum system tightness test 真空严密性试验
Ref. Freon piping to end up done air-tightness test and vacuum test.
冷藏氟利昂管系密性测验和真空测验。
Accommodation air-condition Freon piping to be done air-tightness and vacuum test.
房舱空调氟利昂管系密性试验和真空试验。
Vacuum system is important to the turbines economy operation, and vacuum tightness is the main factor that affects vacuum of steam turbine.
汽轮机真空是汽轮机经济运行的关键，真空严密性是影响汽轮机真空的主要因素。
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