| 单词 | best work |
| 释义 | > as lemmasbest work ΚΠ 1852 J. A. Phillips Man. Metall. 395 The first [class of ore], which is composed of the richest and purest fragments, is called best work, and is reserved for a separate mechanical preparation. 1874 J. H. Collins Princ. Metal Mining (1875) xvii. 113 The tributers find it is to their advantage to divide their piles into two, separating the best work from the seconds. 1902 J. Milne Miner's Handbk. (ed. 3) iii. 286 Quality of ores:—Best work 17 per cent. Second class 7 to 8 per cent. Buddle 5 per cent. < as lemmas |
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