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问题 单项选择题

下列关于急性胆囊炎的特有CT表现，错误的是（）

A.胆囊壁增厚>3mm，边缘模糊

B.胆囊壁周围水肿呈环状低密度影

C.胆囊增大，横径>4.5cm

D.胆总管和胰管扩张

E.胆囊腔或壁内可有气体

答案

参考答案：D

单项选择题

直径较小的棒料一般采用（）来矫正。

A、压力机

B、台虎钳

C、锤击

D、冲床
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单项选择题

(71) analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the (72) for designing and constructing an improved system. (73) is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called (74) . (75) is another such technique that integrates data and process concerns into constructs called objects.

（71）是（）

A.Prototyping

B.Accelerated

C.Model-driven

D.Iterative
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