题目内容
(请给出正确答案)
[单选题]
A.90% copper and 10% silver.B.90% silver and 10% copper.C.90% silver, 9% copper, and 1
A.90% copper and 10% silver.
B.90% silver and 10% copper.
C.90% silver, 9% copper, and 1% lead.
D.None of these.
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