绝对闭塞  1 Nitro propane; absolute block

绝对闭塞系统  absolute block system

绝对闭塞信号  absolute block signal

绝对闭塞制  absolute block system; Block system; Absolute

权宜绝对闭塞  absolute permissive block

权宜绝对闭塞制  absolute permissive block system; Block system; absolute permissive

闭塞号志  block signal; signal; Block

闭塞号志法  Block signaling

权宜闭塞号志  signal; permissive block

人工闭塞号志机  signal; manual blcok

自动闭塞号志  automatic block-signal; auotmatic block signal; signal; automatic block

绝对闭锁  positive block; absolute block

绝对闭锁系统  absolute block system

绝对闭锁信号  absolute block signal

绝对对称  absolute symmetry

绝对对称函数  absolutely symmetric function

闭塞号鋕  block signal

信号闭塞  nonpassage of signals

信号闭塞方式  signal block mode