vacuum material and device 真空材料与器件
vacuum coating material 供真空镀膜材料
high vacuum brazing material 高真空钎料
vacuum-tight material 真空密闭材料
Vacuum bottle with stainless material 不锈钢真空瓶
Vacuum chamber material 真空室材料
vacuum contact material 真空电触头材料
Vacuum conveying material 真空输送物料
Vacuum supplementary material 真空辅料
vacuum state of material 物质真空态
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