Because network backup systems can backup so many computers, they normally utilize tape auto-changer to give them greater storage capacity.
因为网络备份系统，可用于备份这么多的电脑，他们通常利用胶带。
2
The structure and principle of energy storage mechanism in V type on-load tap-changer are analyzed. The torque change rule is presented. It is applied in online monitoring of tap-changer.