简述全面质量管理的特点？
各成本中心的可控成本之和是企业的总成本。
变动成本是指在相关范围内，其总额随业务量成比例变化的那部分成本。
因果研究
What is one of the reasons that custom QoS ACLs are recommended over automatic QoS when configuring ports on a Catalyst 6500 for use with IP phones?（） 79xx IP phones do not automatically mark voice packets with non-zero DSCP values.。 79xx IP phones do not mark protocol packets such as DHCP, DNS, or TFTP with non-zero DSCP values.。 79xx IP phones do not mark voice packets with optimal DSCP values.。 79xx IP phones use a custom protocol to communicate CDP information to the switch.。
What is high availability？（）
