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【单选题】
难溶电解质AB2在水中溶解，反应式为AB3（s）= A3+（aq）+ 3B－（aq），当达平，难溶物AB2的溶解度S/mol·L-1与溶度积KSPθ（AB2）的关系是（）
A.
s /c θ = （2 K SP θ ） 2
B.
s /c θ = （ K SP θ /4 ） 1/3
C.
s /c θ =（ K SP θ /2 ） 1/2
D.
s /c θ =（ K SP θ /27 ） 1/4
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