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| 单词 | mud valve |
| 释义 | > as lemmasmud valve ΚΠ 1860 Sci. Amer. 26 May 352/1 The lower parts of the shafts..may be provided with mud valves for blowing off the deposite [sic] as it accumulates. 1878 Manufacturer & Builder June 124 (caption) The sediment is allowed to accumulate until it rises to a level with the outlet, then mud valves, suitably arranged in the bottom of the tanks, are opened and the sediment washed out. < as lemmas |
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