Accelerated analysis approaches emphasize the construction of (71) to more rapidly identify business and user requirements for a new system. As an accelerated analysis technology, (72) reads the program code and automatically generates the equivalent system model, and the code can be obtained from (73) All system analysis approaches require some form of (74) which includes those techniques to be used to identify or extract system problems and solution requirements from user community. (75) is a classical set of techniques used to collect information about system problems, opportunities, solution requirements, and priorities.

（74）是（）

A. requirement discovery

B. business process redesign

C. cause-and-effect analysis

D. total quality management

一台分裂变压器，容量为40/20-20MVA，已知半穿越阻抗X_1-2’为15%，分裂系数(K_f)为3.5，基准容量为1000MVA。

分裂绕组的电抗标么值X_2’为（）。

A．13.13

B．3.5

C．3.28

D．6.56