手电筒
手电筒:(英文:Flashlight或Torch),简称电筒,是一种手持式电子照明工具。一个典型的手电筒有一个经由电池供电的灯泡和聚焦反射镜,并有供手持用的手把式外壳。虽然是相当简单的设计,它一直迟至19世纪末期才被发明,因为它必须结合电池与电灯泡的发明。
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Abstract: Investment in smart meters and smart grid end equipment continues to grow worldwide as countriestry to make th...
2014-12-24
63
手持式高功率电池充电器
As the performance of many handheld devices approachesthat of laptop computers, design complexity also increase...
2013-11-23
87