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问题: IRON ORE (64.5% with rejection at 63.5%)

IRON ORE (64.5% with rejection at 63.5%)
是什么意思啊?是说64.5% 到63.5%废弃吗?还是纯度为64.5% 的铁矿石中废弃的有63.5% ?
谢谢!

解答:

是说低于64.5% 并且高于63.5%是合格的,低于63.5% 拒收(退回、不合格)