先心病病人术前估计应考虑的主要病理生理是（） A.心脏畸形引起的原发性血流动力异常

-Why not go and have dinner m a restaurant?    

-______. It's too expensive.    [    ]

A. Why not                                  

B. I agree    

C. I'm afraid not                            

D. I'm sure

—We all had a lot of fun at the barbecue yesterday. Pity you weren’t there.

 —I really should have gone with you but I _____ on some remaining problems.

A．worked

B．was working

C．would work

D．would have worked

患者，女，38岁。35岁时即出现闭经，近来腰膝无力，牙齿摇动欲脱，头发枯萎稀疏，记忆力明显减退，舌淡脉沉细。其证候是( )

A．肾精不足

B．肾阳虚

C．肝肾阴虚

D．心脾两虚

E．肾气不固

退货处理办法包括（）

A.无条件重送货

B.运输单位赔偿

C.收取费用，重新送货

D.重新送货或替代

在酶反应器的操作过程中要注意哪些问题。