vacuum bag
真空包
真空成型袋
真空定位袋
负压真空气垫
真空气袋
耐高温3层透明复合袋
真空袋
vacuum bag immobilization
microwave vacuum drying combined with vacuum drying
moulded sand bag embankment and molded concrete bag
126 kV double-break vacuum circuit breaker
20 kV outdoor on-post vacuum circuit breaker
24 kV outdoor high-voltage AC vacuum circuit breaker
absolute pressure vacuum gauge
agitating vacuum process