题目

下列叙述正确的是（） A . 不能用红外光谱区分C2H5OH和CH3OCH3 B . 铁管镀锌层局部破损后，铁管仍不易生锈 C . 某温度下，一元弱酸HA的Ka越小，则NaA的Kh(水解常数)越小 D . 25℃时，pH=2的硫酸与pH =12的NaOH溶液等体积混合溶液显酸性 答案：B2. You doesn't look well and I think you should go to see a doctor.               You doesn't look well. You had better      .