A. taste B. drink C. smell D. feel
A. NH3 B. O2 CO2 D. Cl2
A. otherwise I will to him B. otherwise I would write to him C. otherwise I had written to him D. otherwise I would have written to him
A. 醚类化合物一般存放不能超过一年 B. 腐蚀性试剂宜存放在搪瓷桶中 C. 液体石蜡不需密封保存 D. 烯烃暴露在空气中易生成过氧化物而产生危险
A. mouth B. tone C. head D. tongue