氯丙嗪能阻断
A．α受体
B．β受体
C．M受体
D．N受体
E．DA受体
参考答案：A,C,E
Liu Xiang can't attend the Political Consultative Conferences ____ in Beijing due to training. [ ]
A. to hold
B. held
C. to be held
D. being held
成都农商行对资产保全业务实行（）。
A.分级经营
B.授权经营
C.分类管理
D.统一管理
