患儿8个月，突发高热3天，烦躁，咳嗽频繁，喘憋，发病前4天有皮肤破损及感染史，肺部有散布中、细湿啰音，胸部X线可见斑点状结节阴影，血象白细胞总数增高，核左移，该患儿诊断为（）

A.金黄色葡萄糖球菌性肺炎

B.腺病毒肺炎

C.支原体肺炎

D.呼吸道合胞病毒肺炎

E.肺炎链球菌肺炎

System analysis is traditionally done top-down using structured analysis based on (1). Object-oriented analysis focuses on creation ofmodels. The three types of the analysis model are (2). There are two substages of object-oriented analysis. (3) focuses on real-world things whose semantics the application captures. The object constructed in the requirement analysis shows the (4) of the real-world system and organizes it into workable pieces. (5) addresses the computer aspects of the application that are visible to users. The objects are those which can be expected to vary from time to time quite rapidly.

空白（4）处应选择（）

A.static structure

B.system components

C.data flows

D.program procedures