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中空纤维膜多为非对称结构，由一层极薄、具有一定孔径的致密皮层（孔径0.02~0.2μm，厚度为0.1～1μm）和一层较厚、具有海绵状或指状结构的多孔层（结构约75～500μm厚，孔径约0.1~2μm）组成，截留作用主要发生在皮层，后者主要起支撑作用。
The research institution approved by Nanjing is also an independent legal entity of the first professional research institute of Jiangsu Industrial Technology Research Institute Membrane Science and Technology Research Institute, which is positioned as the organizer of membrane material industry cultivation.
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