在国际市场营销地位中的市场补缺者的作用是（）
A. 拾遗补缺
B. 有选择地跟随市场领导者
C. 见缝插针
D. 攻击市场追随者
E. 打破垄断
切除ATP运行时，列车冒进禁行信号为一般C类事故。
A. 正确
B. 错误
Permission is kindly requested to（）in celebration of our National Day.
A. dress my ship overall
B. raise my ship overall
C. hoist my ship overall
D. display my ship from stem to ster
Which three statements accurately describe layer 2 Ethernet switches?（）
A. Microsegmentation decreases the number of collisions on the network.
B. if a switch receives a frame for an unkown destination,it uses ARP to resolve the address.
C. Spanning Tree Protocol allows switches to automatically share vlan information.
D. In a properly functioning network with redundant switched paths,each switched aegment will contain one root bridge with all its ports in the forwarding state.All other switches in that broadcast domain will have only one root port.
Establishing vlans increases the number of broadcast domains.
F. Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3 address information.
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