题目内容

当晶体三极管的集电结加反向电压，发射结加正向电压时，三极管处于（）状态。

A. 截止
B. 饱和
C. 放大
D. 自由

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低压断路器触点的磨损超过厚度的1/3以上或超程减少到（）时，就应更换新触点。

A. 1/5
B. 1/4
C. 1/6
D. 1/2

加强（），是社会和谐稳定的重要保证。

A. 社会建设
B. 社会管理
C. 社会体制改革

You are planning to connect your three branch offices to the corporate site via Frame Relay. The first branch office has been assigned the network 10.1.0.0/16， the second 10.2.0.0/16， the third 10.3.0.0/16， and the corporate headquarters uses 10.0.0.0/16. You would like to summarize all branch and corporate networks into a single route at the corporate site. Which network address and subnet mask should you choose？（）

A. 10.0.0.0/24
B. 10.0.0.0/16
C. 10.0.0.0/14
D. 10.0.0.0/15

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