李先生，31岁，2年前因左小腿外伤性手术治疗，伤口愈合后又破溃、流脓，反复发作，伤口周围皮肤有色素沉着和湿疹样皮炎。病人目前有发热，局部流脓，并可见经破溃处排出的小碎骨片。

为进一步明确诊断，合理的检查是（）

A.X线片

B.B超

C.MRI

D.核素扫描

E.血管造影

In schedule development, you create a distribution of probable results for each activity and use it to calculate distribution of probable results for the total project. The technique that you are using is ______ .

A．what-if analysis

B．mathematical analysis

C．Monte carlo analysis

D．resource leveling heuristic