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单词
black copper
释义
WordReference Random House Unabridged Dictionary of American English © 2024
black
′
cop
′
per,
[
Metall.
]
Metallurgy
a regulus of 95-percent-pure copper, produced in a blast furnace by smelting oxidized copper ores.
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更新时间:2025/7/23 17:38:18