A一级水≤0.1 μS/cm;二级水≤1.0 μS/cm;三级水≤5.0 μS/cm
B一级水≤0.01 μS/cm;二级水≤0.1 μS/cm;三级水≤0.5 μS/cm
C一级水≤5.0 μS/cm;二级水≤1.0 μS/cm;三级水≤0.1 μS/cm
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