Because oil is like a lock moisture barrier, if this layer protective film disappears, then the water will soon be air-dry the external environment.
因为油脂犹如锁住水分的一道屏障，如果这层保护膜消失不见，那么，水分很快会被外界环境风干。
A preparation method of anodic aluminum oxide film with thick barrier layer is provided, which belongs to the field of material technology.
一种属于材料技术领域的具有厚阻挡层的阳极氧化铝薄膜的制备方法。
A multilayer sheet harmless to human beings, having a certain gas-barrier property, and comprising an easily-produced metal film layer and a packaging material made of the multilayer sheet.
多层片对人体无害，具有一定的气体阻隔性，并包括一个易于制作的金属薄膜层和包装材料的多层片材的。
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