| 单词 | proof-plug |
| 释义 | > as lemmasproof-plug proof-plug n. a plug used to close the breech of a gun barrel while it is being proved. ΚΠ 1875 E. H. Knight Amer. Mech. Dict. III. 1808/1 Proof-plug, a plug screwed temporarily into the breech of a gun-barrel to be proved. 2003 Pressure in Mortar in rec.pyrotechnics (Usenet newsgroup) 15 Feb. To generate high pressures for purposes of proof testing shotguns, a ‘proof plug’ weighing several times the normal shot charge is used. < as lemmas |
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