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问题 单项选择题

在500名病例与500名对照的匹配病例对照研究中，有400名病例与100名对照具有暴露史。据此资料，计算OR值为（）。

A.16

B.18

C.20

D.10

E.无法计算

答案

参考答案：A

单项选择题

数据库设计的起点是( )

A．用户需求分析

B．概念结构设计

C．存储结构设计

D．物理结构设计
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单项选择题

Microsoft’s COM is a software (71) that allows applications to be built from binary software components. COM is the underlying architecture that forms the foundation for higher-level software services, like those provided by OLE. COM defines a binary standard for function calling between components, a way for components to dynamically discover the interfaces implemented by other components, and a mechanism to identify components and their interfaces uniquely.

OLE is a compound (72) standard developed by Microsoft. OLE makes it possible to create (73) with one application and link or embed them in a second application. Embedded objects retain their original format and (74) to the application that created them. Support for OLE is built into the Windows and MacOS Operating Systems. A (75) compound document standard developed mainly by Apple and IBM is called OpenDoc.

（71）处填（）。

A．structure

B．procedure

C．protocol

D．architecture
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