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Subject : 
附加电源
 
Description : 
我需要在本地设备上使用外部电源适配器?
 
Solution : 
在大多数情况下,总线电源是足够的,但是如果您的设备[如外部硬盘驱动器]接近500ma(.5a),则需要包括电源适配器。
 
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