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【单选题】
某斜管沉淀池产水量为15000m3／d，水厂自用水量为5％，设计表面负荷q=10m3／(m2.h)。采用厚0．4mm塑料热压成的正六角，内切圆直径d=25mm，长1000mm，水平倾角θ=60°，假设沉淀区设计清水面积等于净出口面积，斜管结构系数按1．03计，则此斜管沉淀池内的Fr为( )。
A.
1．59×10-4
B.
1．75×10-4
C.
1．52×10-4
D.
1．67×10-4
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