在规定的适应证、用法和用量的条件下,能满足预防、治疗、诊断人的疾病,有目的地调节人的生理功能是
A.有效性B.安全性C.稳定性D.均一性E.经济性
参考答案:A
Recently a survey ________ prices of the same goods in two different supermarkets has caused heated
debate among citizens.[ ]
A. compared
B. comparing
C. compares
D. being compared
刚性药头和弹性药头有哪些不同处?说出它们的优缺点?