A:b、c、f中依次盛装饱和食盐水、浓硫酸、浓硫酸
B:g中发生的反应为Cl2+2NaOH=NaCl+NaClO+H2O
C:e装置的收集器必须保持干燥
D:实验时,a和d处酒精灯应同时点燃
His friends asked him ________ up smoking.