| 单词 | valve-board |
| 释义 | > as lemmasvalve-board valve-board n. ΚΠ 1869 Eng. Mech. 24 Dec. 352/3 There is a board screwed down on the top of A. That is the valve-board. 1885 C. G. W. Lock Workshop Receipts 4th Ser. 290/2 The valve-boards are next hinged on to the feeder-boards. < as lemmas |
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