“block system”的概念、定义、翻译、参考文献-科学参考

单词	block system
释义	block system [`bläk ´sis·tǝm] ^{CIVIL ENGINEERING} A railroad system for controlling train movements by using signals between block posts, that is, the structures that contain the instruments indicating the positions of trains, conditions within block sections, and control levers for signals and other functions. ^{MINING ENGINEERING} A system of pillars in which a series of entries, rooms, and crosscuts are driven to divide the coal into blocks of about equal size which are then extracted on retreat.
随便看	carbon-arc brazing carbon-arc cutting carbon-arc lamp carbon-arc welding carbonate carbonate cycle carbonate mineral carbonate reservoir carbonate rock carbonate spring carbonation carbonatite carbon bit carbon black carbon brush carbon burning carbon burning rate carbon button carbon canister carbon cycle carbon-detonation supernova model carbon diamond carbon dioxide carbon dioxide absorption tube carbon dioxide fire extinguisher

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