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【多选题】
下列说法是否正确?请写出正确的序号。
A.
水体被易于氧化的有机物所污染，水中溶解氧下降。
B.
溶解氧对于水生动物的生存有密切关系
C.
水中溶解氧在3～4mg/L时，鱼类就不能生存
D.
水中溶解氧的浓度与溶解氧饱和百分率相等
E.
溶解氧在水中有比较大的溶解度
F.
电化学探头法（膜电极法）适用于溶解氧小于0.1mg/L的水样
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