(31) analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the (32) for designing and constructing an improved system. (33) is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called (34) . (35) is another such technique that integrates data and process concerns into constructs called objects.

（33）是（）

A. Structured analysis

B. Information Engineering

C. Discovery Prototyping

D. Object-Oriented analysis

梁截面高度的确定应考虑三种参考高度，是指由建筑高度确定的最大梁高，由刚度条件确定的______和由经济条件确定的经济梁高。