英语词汇“positive block”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	positive block
释义	positive block noun : a block in which only one railroad train is allowed to be at one time compare block system
随便看	ULC ULCC ulcer ulcer disease ulcerate ulcerated ulcerates ulcerating ulceration ulcerations ulcerative ulcerative colitis ulcerative lymphangitis ulcered ulcering ulcero- ulcerogenic ulceromembranous ulcerous ulcers ulema ulemas ules uletic ulex

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positive block