为完成后勤职能而采取的封闭行动顺序。一个工作周期可以包括，例如，空载，定位，负载拾取，载运，定位，负载交付以及空运至原点。
Closed sequence of motions for the completion of logistics functions. A work cycle can consist of, for example, riding empty, positioning, load pick-up, load ride, positioning, load delivery, and travelling empty to the origin.
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