pentax 645z 實拍網站相關資料
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pentax 645z 實拍網站相關資料
Power Factor Correction
The power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load, to the apparent power in the circuit. …
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iVokaMINI X
测试帐号:13564653551/000000 ios版已上架:http://app.91.com/Soft/Detail.aspx?Platform=iPhone&f_id=10122087 ================================================== iV …
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