软件生命周期可分为定义阶段、开发阶段和维护阶段。详细设计属于_爱下问搜题

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问题单项选择题

软件生命周期可分为定义阶段、开发阶段和维护阶段。详细设计属于

A．定义阶段

B．开发阶段

C．维护阶段

D．上述三个阶段

答案

参考答案：B

解析：软件生命周期由软件定义、软件开发和软件维护三个时期组成。软件定义可分为软件系统的可行性研究和需求分析两个阶段。软件开发时期由5个阶段组成：概要设计、详细设计、编写代码、组装测试和确认测试。软件维护时期的主要任务是使软件持久地满足用户的需要。

完形填空

Although in 1947 we were still very new to the atomic age, we knew about mushroom clouds. A huge crack (裂缝) spread across the library wall upstairs, sending teachers and __31__ screaming down the hall.
Had a new world war started? Palefaced, our young science teacher quickly__32__us for a fire drill. We huddled (卷缩) in little groups on the beach side of the school grounds and__33__the spreading cloud darken the bright spring sky.
Rumors flew every which way，__34__two hours would pass before we got the full story. One rumor we heard was that the Texas City Monsanto Chemical plant had__35__； children whose parents__36__there began to cry.
I__37__—that was where my father was working that day.
The school bell called us back inside, and we were dismissed (解散) to__38__our way home the best way we could. I'd walked a quarter of the threemile trip to my home__39__a car horn frightened me to__40__. My Uncle Barney__41__alongside me in his old Ford. The instant I saw him, I knew my father__42__. Otherwise, Papa would have__43__for me himself.
As if in slow motion from a great distance, Uncle Barney motioned for me to__44__. Numb with grief, I crawled into the back__45__. I barely took notice of the man sitting there, and didn't recognize him until he__46__me. When Papa put his strong arms around me, I forgot for a moment that Cherokees aren't supposed to__47__.
Many of my fellow students lost their__48__in the explosion. Tragedy would one day come to our__49__， as it inevitably (不可避免地) comes to all, but one day Texas City blew up, it miraculously (奇迹般地) passed us by. Because he lost his keys on that April morning, as he explained, my father lived for__50__32 years—we were to have a second lifetime forever.

B．been closed

C．been opened

D．been on fire

C．get through

C．reached for

多项选择题

顶板下沉主要发生在（）阶段。

A、开挖过程中

B、上断面开挖

C、下断面开挖及立柱托换

D、支撑拆除

E、施工时