Ref. Freon piping to be done air - tightness test and vacuum test.

冷藏氟利昂管系密性试验和真空试验.

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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.

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Low temperature environment a cascade refrigeration system in the thermal vacuum test facility of spacecraft subassembly.

卫星部组件热真空试验设备制冷系统提供试验设备的冷黑环境.

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