block system

[′bläk ‚sis·təm] (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.

单词	block system
释义	block system block system n. A system for controlling and safeguarding the flow of railway trains in which track is divided into blocks, each controlled by automatic signals. block system block system [′bläk ‚sis·təm] (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	vypd vyph v-y plasty v-y-plasty vypll vypolzovo vyps vyr vyraa vyrdt vyrgan, ivan vyrgan, ivan anikeevich vyritsa vyrodkov, ivan vyrodkov, ivan grigorevich vyronas vyrubov, grigorh vyrubov, grigorh nikolaevich vys vysa vyse vyser vysha vyshelesskh, sergei vyshelesskh, sergei nikolaevich