干式站用变接线端子的接触面应镀锡，（）及以上站用变低压出线要求配置铜质平板接线端子。

A.100kVA

B.120kVA

C.160kVA

D.180kVA

(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.

（31）是（）

A.Prototyping

B.Accelerated

C.Model-driven

D.Iterative