Many of the activities performed during the preliminary investigation are still beingconducted in  （1） , but in much greater depth than before. During this phase, the analystmust become fully aware of the  （2）  and must develop enough knowledge about the（3）  and the existing systems to enable an effective solution to be proposed andimplemented. Besides the  （4）  for process and data of current system, the deliverablefrom this phase also includes the  （5）  for the proposed system.
（1）A、analysis phase
B、design phase
C、implementation phase
D、maintenance phase
（2）A、main symptom
B、root problem
C、final blueprint
D、data specification
（3）A、hardware environment
B、testing environment
C、software environment
D、business environment
（4）A、logical models
B、physical models
C、design models
D、implementation models
（5）A、hardware and software specification
B、system performance specification
C、formal requirements definition
D、general problem statement