白银买进:15000X10.5=157500
卖出:15000X28.5=427500
纯赚:427500-157500=270000
白银买进:15000X10.5=157500 卖出:15000X28.5=427
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白银买进:15000X10.5=157500
卖出:15000X28.5=427500
纯赚:427500-157500=270000