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单词 extractor groove
释义 extractor groove
[ik`strak·tǝr ´grüv]
ORDNANCE
Groove machined in the base of a cartridge case, a short distance above the head, which receives the extractor of the breech mechanism and permits the case to be withdrawn by the extractor; used in automatic weapons, in preference to extractor rims (flanges) formed on the cartridge case base.
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