纵隔肿瘤出现
A.干咳B.嘶哑性咳嗽C.金属音调咳嗽D.变换体位时咳嗽E.犬吠样咳嗽
参考答案:C
()analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the()for designing and constructing an improved system.()is such a technique. The emphasis in this technique is process-centereD. Systems analysts draw a series of process models called().()is another such technique that integrates data and process concerns into constructs called objects.
Ultimately, the system models become the () for designing and constructing an improved system.
A.image
B.picture
C.layout
D.blueprint
交流接触器上短路环的作用是什么?