| http://www.w3.org/ns/prov#value | - In the present invention, the coarse structure layer is a layer with a higher open pore ratio which exists adjacent to the membrane surface, and preferably it is a layer in which (A) open pore ratio is the average open pore ratio of the whole membrane thickness+2.0% or more (hereinafter referred to as the coarse structure layer of (A)), more preferably+2.5% or more of layer, particularly preferabl
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