| 单词 |
self-acting door |
| 释义 |
self-acting door self-acting door[′self ¦ak·tiŋ ′dȯr] (mining engineering) A ventilation door that is constructed of two halves which move on small pulleys and which are forced apart centrally as the trams come in contact with the converging beams that operate the door. |
| 随便看 |
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