题目内容

以下正确描述嵌入式系统的设计流程的是(60)。

A. 系统需求分析→硬件和软件划分→系统详细设计→迭代与实现→系统集成→系统测试→系统维护
B. 系统需求分析→硬件和软件划分→系统详细设计→系统集成→迭代与实现→系统测试→系统维护
C. 系统需求分析→系统集成→硬件和软件划分→系统详细设计→迭代与实现→系统测试→系统维护
D. 系统需求分析→硬件和软件划分→迭代与实现→系统详细设计→系统集成→系统测试→系统维护

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【B18】

A. spent
B. took
C. costed
D. lasted

Although the bulk of industry resources and energies have focused on developing the fastest(71)or slickest(72), more and more mindshare is turning to the evolution of the computer interface. Advancements in the areas of input devices,(73)processing and vitual reality could lead to fundamental changes in the way human and computer interact. The technological battlefield of the future will be adding layers between the user and the raw machine to make the(74)as invisible as possible.(75)crepresents the next evolutionary step for the interface.

A. microprocessor
B. format
C. structure
D. procedure

【B16】

A. transaction
B. transition
C. transmission
D. transformation

一系统由A、B、C三个子系统串联而成，它们的寿命均服从指数分布，其中A、B的MTBF分别是200h、400h。现要求系统的MTBF在100h以上，则子系统C的MTBF至少为(3)h。

A. 50
B. 200
C. 400
D. 700