一下属于理想的栓塞剂应具备的条件是（）
A.无毒性
B.无抗原性
C.好的生物相容性
D.不透X线
E.易经导管注入
参考答案：A, B, C, D, E
— What will Lucy do this Sunday?
— She as well as her family _____ go camping by a small lake. [ ]
A. am going to
B. is going to
C. are going to
可行性研究的主要作用是为建设项目( )提供依据。
A．项目评估 B．投资决策C．项目设计 D．效益评价
