向有机物分子中引入()的反应都是磺化反应。
A.磺酸基
B.磺酸基的盐
C.卤磺酰基
D.硫酸根离子
参考答案:A, B, C
the responsibilities of the family, I worked hard to earn a living.
A.Being burdened with
B.Burdened with
C.Burdening with
D.To burden with
计算:(-a2b)3=( );-(-4xy3)3=( )。