急慢性肝炎和肝硬化主要表现为Atb降低、β-和γ-球蛋白增高,常出现'β-γ桥'引起此现象的蛋白是
A.IgA
B.IgD
C.IgM
D.IgG
E.IgE
参考答案:A
21st century school edition is ____a newspaper .It helps us to improve our English a lot .
A.no less than
B. no more than
C.less than
D.more than
加油站设备检修需动用明火时,加油站必须停止加油作业。()