| 单词 | test-ring |
| 释义 | > as lemmastest-ring test-ring n. (a) see quot.; (b) a ring-shaped piece of iron, etc., taken as a sample of the metal of which it is made ( Cent. Dict., Suppl. 1909). ΚΠ 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 185 Test-ring, an oval iron frame holding a test or movable cupelling-hearth. < as lemmas |
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