传统产业

A. PVST+reduces the CPU cycles for all the switches in the network
B. PVST+automatically selects the root bridge location,to provide optimized bandwidth usage.
C. PVST+allow the root switch location to be optimized per vlan.
D. PVST+supports Layer 3 load balancing without loops.

A. 碳、氢
B. 二氧化碳
C. 甲烷
D. 氮氧化物

A. 凭证修改
B. 凭证审核
C. 凭证记账
D. 凭证录入