烧伤创面外用药磺胺米隆的常用浓度为()
A.0.5%~1%
B.1%~5%
C.5%~10%
D.15%~20%
E.20%~30%
参考答案:C
完全竞争市场的条件是什么?
"______ did you live there" "For about two years."
A. How often B. How far C. How long