职业守则是指从业人员在职业活动中应该遵循的行为准则。
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What are the characteristic of link state routing protocols?（）
A. The exchange of advertisement is triggered by a change in the network.
B. All routers exchange routing tables with each other iIn a multipoint network.
C. Packets are routed based upon the shortest path to the destination.
D. Paths are chosen depending on the cost efficiency factor.
Every router in an OSPF area is capable of representing the entire network topology.
F. Only the designated router in an OSPF area can represent the entire network topology.
控显机采用PC总线工控机。机箱内除安装连接操作显示设备的接口板外，安装2块带有光电转换的串行通信接口卡INIO，用于（）通信。
进行制动机实验时，手信号显示用检查锤作圆形转动表示（）
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