route locking section 进路锁闭区段
through route locking 进路完全锁闭
route locking circuit 进路锁闭电路
approach route locking 进路接近锁闭
sectional route locking 分段进路锁闭
route locking protection 进路锁闭防护法
route locking indication 进路锁闭表示
sectional route locking circuit 进路分段锁闭电路
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