单项选择题
LANs can be connected by using bridges, which operate in the ( )。
A. physical layer
B. data link layer
C. network layer
D. transport layer
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单项选择题
Which of the following operations belongs to message passing
A.read and write
B.save and receive
C.wait and signal
D.P and V
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单项选择题
制定软件计划的目的在于尽早对欲开发的软件进行合理估价,软件计划的任务是( )。
A. 规划与调度
B. 分析与估算
C. 设计与测试
D. 组织与管理
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