单胺氧化酶主要用于诊断（）。
A.病毒性肝炎
B.原发性肝癌
C.肝硬化
D.脂肪肝
E.阻塞性黄疸
参考答案：C
How long his dog ? [ ]
A. has, been dead
B. has, died
C. has, been died
D. has, dead
减缩喷管
