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问题 单项选择题

男性，63岁。胰腺癌术后2年，CA-199持续升高。CT发现肝脏低密度占位，PET见FDG代谢增高灶。诊断首先应考虑（）。

A.原发性肝癌

B.肝血管瘤

C.肝脓肿

D.肝转移癌

E.肝囊肿

答案

参考答案：D

单项选择题

System analysis is traditionally done top-down using structured analysis based on (1) ．Object-oriented analysis focuses on creation of models．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 ofthe application that are visible to users．The objects are those which can be expected to vary from time to time quite rapidly．

2（）

A．function model，class model and state model

B．class model，interaction model and state model

C．class model，interaction model and sequence model

D．function model，interaction model and state model
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单项选择题

正态分布μ±1.96s的面积占总面积的（）

A.95.00%

B.68.27%

C.95.45%

D.98.00%

E.99.00%
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