此种表面防护层的应用，使得活塞杆具有相当的耐腐蚀性。
The type of surface finish applied to the rod determines to a great extent the corrosion resistance of the piston rod.
其原因在于存在于合成物表面的PEG链能起到防护层的作用，进而抑制了由于非特异性蛋白质的吸附而引起的聚集反应。
This was attributed to the PEG chains present on the surface of complexes that could work as a protective shield layer against aggregation caused by non-specific protein adsorption.
不。3m所有一次性防护口罩的过滤材料都是聚丙烯材质，表面的保护层是聚丙烯和聚酯的复合材料。
No. All 3m disposable respirators have filter media made from polypropylene and coverings made from a combination of polypropylene and polyester.
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