题目内容
POP3协议采用___________(23)模式，客户端代理与POP3服务器通过建立___________(24)连接来传送数据。 (24)
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在分布式数据库中有分片透明、复制透明、位置透明和逻辑透明等基本概念，其中：___________(19)是指局部数据模型透明，即用户或应用程序无须知道局部使用的是哪种数据模型；___________(20)是指用户或应用程序不需要知道逻辑上访问的表具体是怎么分块存储的。 (19)
某建筑工程公司承包某工程，需施工机械一台完成其中一项主要分项工程，工程量为6000m3，有两种方案：A购买进口机械，购置费100万元/台，寿命期为12年，期末残值率10%；每4年大修一次，每次大修费6万元/台，经常修理费为0.5万元/(台·年)；年运行费为4万元/台；台班产量100m3/台班。B购买国产机械，购置费40万元/台，寿命期为8年，期末残值率5%；每3年大修一次，每次大修费5万元/台，经常修理费为1万元/(台·年)；年运行费为6万元/台；台班产量80m3/台班。两种设备每年正常的工作台班为200台班。 台班单价按年度费用除以年工作台班计算，假设机械每天安排一班，该分项工程的计划工期为60天，为按计划完工可采取加班方式赶工(即每天两班)，加班时工作效率降低系数为0.15，加班时台班单价不变，计算两种机械按计划完工时完成该分项工程的机械费并选择施工机械。(计算结果保留2位小数)
对于逻辑表达式((a‖(b＆c))‖(C&&d))，需要___________个测试用例才能完成条件组合覆盖。
In a world where it seems we already have too much to do，and too many things to think about，it seems the last thing we need is something new that we have to learn．But use cases do solve a problem with requirements：with____________(71)declarative requirements it’s hard to describe steps and sequences of events． Use cases，stated simply,allow description of sequences of events that，taken together, lead to a system doing something useful．As simple as this sounds，this is important．When confronted only with a pile of requirements，it’S often ____________(72)to make sense of what the authors of the requirements really wanted the system to do．In the preceding example，use cases reduce the ambiguity of the requirements by specifying exactly when and under what conditions certain behavior occurs；as such，the sequence of the behaviors can be regarded as a requirement．Use cases are particularly well suited to capturing these kind of requirements．Although this may sound simple，the fact is that __________(73)requirement capture approaches，with their emphasis on declarative requirements and”shall”statements．completely fail to capture the___________(74)of the system’s behavior．Use cases are a simple yet powerful way to express the behavior of the system in Way that all stakeholders can easily understand． But，like anything，use cases come with their own problems，and as useful as they are，they can be ___________(75)．The result is something that is as bad，if not worse，than the original problem．Therein it’s important to utilize use cases effectively without creating a greater problem than the one you started with． (71)
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