automatic block signal system造句

"automatic block signal system"是什么意思   


  1. The investigation recommended that the Automatic Block Signal system be extended across the whole of the route.
  2. During the 1950s and 1960s the Montauk Branch Kew Gardens ( Richmond Hill ) train collision, the railroad began to install an Automatic Speed Control system to supplement ( and later replace ) the wayside automatic block signal system on a majority of its lines.
  3. It's difficult to find automatic block signal system in a sentence. 用automatic block signal system造句挺难的


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