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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self maintained discharge 自持放电
non-self-maintained discharge [电] 非自持放电
non self maintained discharge 非自持放电
non-self-maintained gas conduction [电子] 非自持气体导电
self-maintained push-button 自持按钮
self-maintained gas conduction 自持气体导电
discharge self-maintained 自持放电
self-maintained discharge [电] 自持放电
They were maintained by normal self-pollination.
它们保持正常的自花授粉繁殖。
On the treatment of mental disorder, Laing maintained promoting sufferers self-recover by changing the sufferers survival environment.
在精神疾病的治疗方面，莱因主张通过改变患者的生存环境来促使其进行自我恢复。
LNG storage tank will be maintained in safe and stable state by the way of self-increasing voltage through the self-control boost valve.
利用自力式增压调节阀为储罐自动增压可保证LNG储罐的平稳操作和安全供气。
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