positive list system system
inter-backup system for central control system and district-level dispatch system
Single school system; Single track system; Unitary school system
Single track system; Single school system; Unitary school system
Unitary school system; Single school system; Single track system
cut edge and cut vertex
cut-in and cut-out motors
Cut-to-cut tool change time
thirty-degree piezoelectric cut (=Y-cut)
voltage cut off or current cut off