●Many of the activities performed during the preliminary investigation are still being conducted in__(71)__，but in much greater depth than before.During this phase，the analyst must become fully aware of the__(72)__and must develop enough knowledge about the__(73)__and the existing systems to enable an effective solution to be proposed and implemented.Besides the__(74)__for process and data of current system，the deliverable from this phase also includes the__(75)__for the proposed system.
（71）A．analysis phase
B．design phase
C．implementation phase
D．maintenance phase
（72）A．main symptom
B．root problem
C．final blueprint
D．data specification
（73）A．hardware environment
B．testing environment
C．software environment
D．business environment
（74）A．logical models
B．physical models
C．design models
D．implementation models
（75）A．hardware and software specification
B．system performance specification
C．formal requirements definition
D．general problem statement