breech door造句

"breech door"是什么意思   


  1. For example, an interlock prevents the breech door and muzzle door from opening at the same time.
  2. The top breech door is shut, and the TDU is flooded and equalized with sea pressure, the ball valve is opened and the cans fall out assisted by scrap iron weights in the cans.
  3. It's difficult to find breech door in a sentence. 用breech door造句挺难的


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