branch-boxing with switch network structure of main and auxiliary lines
integrated control for main and auxiliary system
main and auxiliary battery
main and auxiliary fans
Main and Auxiliary Lines
main and auxiliary system
parallel operation of main and auxiliary computers
ring main structure of main and auxiliary lines
separaling main and auxiliary part
Ventilation by main and auxiliary fans
Connection Section between Horizontal Adit and Main Tunnel
convergent area of main and branch
cross needle and main hook
electromagnetic main-and-collateral-channels cure instrument
integration of main and backup protection
integration of main and backup protections
Interface between tip leakage flow and main flow
Intersection of Inclined Shaft and Main Tunnel