在下列各种试剂中，哪项用作缓冲溶液()。
A. HCl+NaCl
B. HC2H3O2+NaC2H3O2
C. NaOH+NH4OH
D. HCl+HC2H3O2
E. NaOH+NaCl
肠溶衣片崩解时限的要求为
A. 15分钟
B. 30分钟
C. 1小时
D. 2小时
E. 5小时
Which of the following questions is not mentioned by Clara as one might be asked during an
A. Why are you interested in the new job？
B. How much are you paid in your present job？
C. How old are you？ Where are you from？
D. Where do you live？ How do you get to work？
下列反应属于鉴别巴比妥类药物苯环取代基反应的是
A. 铜盐反应
B. 汞试液反应
C. 硫元素的反应
D. 亚硝酸钠一硫酸的反应
E. 以上都不是
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