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【单选题】
10 mol/L NH 3 (p K b =4.75 ) 溶液 40.0 ml 与 0.10 mol/L 的 HCl 20.0 ml 混合 , 此时溶液的 pH 为 ( )A.
8.1
B.
2.87
C.
4.75
D.
9.25
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【单选题】某企业刘某的月工资为5000元，假设用人单位强制性缴费的划入口例为30%，则王某个人医疗保险账户每月的储存额是（ ）元。
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