以下关于冷冻麻醉叙述错误的是（）

A.应用药物使局部组织迅速散热，温度骤降，局部感觉，首先是冷热感觉，随后痛觉消失

B.常用药物氯乙烷

C.一般持续时间约3～5min

D.麻醉区域浅表

E.应用氯乙烷时麻醉区域周围的组织应涂布凡士林加以保护

(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.

（32）是（）

A.image

B.picture

C.layout

D.blueprint