治疗脓疱疮外用药有（）。
A.甲硝唑凝胶
B.红霉素软膏
C.鱼石脂软膏
D.百多邦软膏
参考答案：A, B, C, D
在不透明布袋中装有红球4个，白球6个，则摸到红球的概率是____
A system of cleaning the tanks by washing them with the cargo of crude oil while it is being discharged is known as（）.
A.cow
B.lot
C.cbt
