Service(71)Architecture aims to provide a model for the creation of service components in a wide range of languagesand a model for assembling service components into a business solution-activities which are at the heart of buildingapplications using a(72)architecture.

 Service Data Objects aims to provide consistent means of handling(73) within applications, whatever its source or (74) may be. SDO provides a way of unifying data handling for databases and for services. SDO also has mechanisms for the handling of data while(75) from its source.

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Service(71)Architecture aims to provide a model for the creation of service components in a wide range of languagesand a model for assembling service components into a business solution-activities which are at the heart of buildingapplications using a(72)architecture.

 Service Data Objects aims to provide consistent means of handling(73) within applications, whatever its source or (74) may be. SDO provides a way of unifying data handling for databases and for services. SDO also has mechanisms for the handling of data while(75) from its source.

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软件的维护并不只是修正错误。为了满足用户提出的修改现有功能、增加新功能，以及一般性的改进要求和建议，需要进行(10)，它是软件维护工作的主要部分；软件测试不可能发现系统中所有潜在的错误，所以这些程序在使用过程中还可能发生错误，诊断和更正这些错误的过程称为(11)；为了改进软件未来的可维护性或可靠性，或者为了给未来的改进提供更好的基础而对软件进行修改，这类活动称为(12)。

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有8套计算机应用软件A、B、C、D、W、X、Y、Z要进行系统集成安装。虽然每套应用软件占用的存储空间不大，但部分应用软件调用操作系统底层相同的动态链接库(DLL)，出于安全考虑，某些应用软件不能安装在同一台服务器上。在图4-2中，符号“×”表示相应的两套计算机应用软件不能安装在同一台服务器上。那么这8套应用软件至少需要安装在(61)台服务器上，实现这种最少服务器台数的系统集成方案(不计各软件安装顺序)可有(62)个。