This book is three times as _ as that one. [ ]
A. thick
B. thicker
C. more thick
答案:A
我国目前许可使用但,不少国家已禁用的漂白剂是()。
A、BPO
B、偶氮甲酰胺
C、溴酸钾
D、亚硫酸及其盐类
预氧化