造成患者轻度伤残、器官组织损伤导致一般功能障碍的医疗事故的级别是（）
A.五级
B.四级
C.三级
D.二级
E.一级
参考答案：C
— I can't understand what the teachers talk in class. what should I do?
— Why not ________ them what you don't know after class?[ ]
A. ask
B. to ask
C. you ask
D. asking
电信管理网中主要使用的协议是( )。
A．SNMP
B．RMON
C．CMIS/CMIP
D．LMMP
