A porous silk fibroin membrane could be prepared through freeze-drying process, with dense top surface, porous bottom surface in low porosity and porous inner portion in high porosity.
采用冷冻干燥法可以制得下表面为致密结构，上表面为孔隙率较小的多孔结构，而内部是孔隙率较大的多孔结构的丝素膜。
The abundant AOM of the Wenchang Formation reflects the high productivity in the surface water and reducing dysoxic conditions in the bottom water of the Palaeogene lake.
文昌组的无定形有机质反映了古湖泊表层水的高生产力和湖底水体的贫氧环镜。
This product is coated with a tacky residue-free adhesive on the surface of each layer to attract dirt seeds and a high tack adhesive on the bottom layer for maximum adhesion to the substrate.
该产品每层外测涂有无残留物的粘胶剂，吸附环境中的粉尘；底面又涂有高粘度的粘胶剂，黏附于各种表面。
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