不透水岩基上有水平分布的三层土,厚度均为1m,渗透系数分别为k1=1m/day,k2=2m/dayk3=10m/day,则等效土层垂直渗透系数kZ为()
A.13m/day
B.10m/day
C.4.33m/day
D.1.88m/day
正确答案:1.88m/day
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