Use the arrow keys (or keep hitting Win+P) to switch to “clone”, “extend” or “external only” display settings.

用箭头(或继续猛击Win+P)来切换"不投影"、"镜像屏"、"扩展屏"或"关内屏"的设置。

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The works correct some mistakes in published literatures on (R, Q) optimization and extend safety stock research to the settings with resource constraints and supply chain contracts.

从而纠正了（R，Q）策略研究的一些不妥之处，将安全库存研究扩展到资源有限与特定契约情形；

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