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某工厂加工一批定制口罩，计划15天完成
【例7】（2018广西）某工厂加工一批定制口罩，计划15天完成，做完第5天时订货方要求追加50％的订货量， 且最多延迟5天交货。 问工厂的工作效率至少需要提高： Ａ.1/3 Ｂ.1/4 Ｃ.1/5 Ｄ.1/6
工程问题专项知识精讲及历年真题解析视频合集8/43
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