(A)酸性 (B)弱酸性 (C)堿性 (D)弱堿性
(A)5mg/L (B)0.6mg/L (C)0.01mg/L (D)0.007mg/L
(A)0mg/L (B)0.002mg/L (C)0.01mg/L (D)1mg/L