枯痔散疗法的作用机制是：
A．湿性坏死疗法B．干性坏死疗法C．硬化萎缩疗法D．插药疗法E．以上均不对
参考答案：B
—Whose book is this?
—It ____ be Linda's. It has her name on it. [ ]
A. can
B. may
C. must
D. need
下列哪项可用于生产乙肝疫苗
A．HBeAg
B．HBsAg
C．HBcAg
D．HBV
E．HBVDNA
