ACER 45W 原廠規格 變壓器 Aspire C20-820 A111-31 A114-31 A315-31 A315-33 A315-51 R3-131T V3-574 V3-574G V3-574T Gateway EC19C LT23 LT28 NE512 eMachines 350 355 Chromebooks AC700 Iconia W500 W500P Travelmate P245 MS2380 P258 P276-M P276-MG TMP446-M TMP449-Mg 8172T