8月20日，上期所铜期货仓单53079吨，环比前一日减少3619吨；铝期货仓单285231吨，环比前一日减少5305吨；锌期货仓单115060吨，环比前一日减少1吨；铅期货仓单63918吨，环比前一日减少1572吨；镍期货仓单102197吨，环比前一日增加199吨；锡期货仓单5424吨，环比前一日减少167吨。
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