Based on both the ordered quantity and lead time as decision variable, this article proposes a single item multi-supplier model that considers inventory problems with quantity discount and backorder.是什么意思_Based on both the ordered quantity and lead time as decision variable, this article proposes a single item multi-supplier model that considers inventory problems with quantity discount and backorder.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句