How often do you use WeChat ?
A. three days
B. every day
C. a week
D. a month
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利用药物溶解行为的差异进行杂质检查的方法属于()
A. 物理性状检查法
B. 化学方法
C. 光谱分析法
D. 色谱分析法
_________ means a computer that is portable and suitable for use while traveling.
A. laptop
B. converter
C. hard drive
D. digital TV
面积归一法属于哪种杂质检查方法()
A. 薄层色谱法
B. 光谱法
C. 高效液相色谱法
D. 化学法
In which aspects has your life been affected by digital products?
A. pay the bill
B. order food
C. shopping online
D. A, B and C