1. [多选题]碳水化合物提供热能占总热能
A. 1%~3%
B. 10%~12%
C. 12%~14%
D. 20%~30%
E. 55%~65%
2. [多选题]饮用水卫生标准规定,用氯消毒时
A. 接触1~2h,游离性余氯不低于(no less than)2mg/L
B. 接触1~2h,游离性余氯不低于(no less than)0.2mg/L
C. 接触0.5h,化合性余氯不低于(no less than)0.5mg/L
D. 接触0.5h,游离性余氯不低于(no less than)2mg/L
E. 接触0.5h,游离性余氯不低于(no less than)0.3mg/L