同时，PD64004A能与PD64012作各种形式的结合，使交换机制造商可设计4埠至48埠自发的自我维护（self-maintained）PoE，支援侦测、即时保护，以及交流讯号侦测断电或直流讯号侦测断电等功能。
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故障自动检测，方便自我维护。
人们希望可以自我疗养，自我维护且容易管理的治疗方案。
People want systems of self-care, self-maintenance, and easily administered therapy.
当大学生的就业权益受到侵犯时，大学毕业生可依据《民法》、《劳动法》、《仲裁法》的相关规定进行自我维护。
When their rights and interests are violated, graduating students can appeal to self-protection according to relative regulations of Civil Laws, Labor Laws, and Arbitration Laws.
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