采用无压非完整井系统进行降水施工,实测地下含水层的厚度为8m,渗透系数为16m/d,降水深度要求不小于3.5m.假想半径为24m,抽水影响深度为10m,通过计算选择正确的选项。抽水影响半径R=()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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