气性坏疽时，最紧急的处理措施是（）。

A.彻底清创，广泛、多处切开

B.应用大量抗生素，首选青霉素

C.高压氧治疗

D.支持疗法，包括输血及营养支持

E.中药治疗

（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）处填（）。

A．Prototyping

B．Accelerated

C．Model-driven

D．Iterative