HX 的电离常数 Ka ＝ 1×10－4 ，在0.05 mol·L－1 HX 和0.50 mol·L－1的 KX 溶液中，其 [H+] 近似是

___While therere quite few differences in the eduction system, in mny countries eduction is ____.usul B．regulr C．norml D．universlA．usualB．regularC．normalD．universal

A、private int num; public string Num { get{return num;} set{num=value;} }
B、private int num; public int Num { get{return num;} set{num=value;} }
C、private int num; public int Num { get{num=value;} set{return num;} }
D、private int num; private int Num { get{return num;} set{num=value;} }

tionWhile therere some differences in the eduction systems in mny countries in the world, eduction is __________.humorous B．universl C．fithful D．foolishA．humorousB．universalC．faithfulD．foolish