英语词汇“permissive block system”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	permissive block system
释义	permissive block system permissive block system [pər¦mis·iv ′bläk ‚sis·təm] (civil engineering) A block system in which a railroad train is permitted to enter a block section already occupied by a train.
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