为什么电源走线选用最上面的金属层？
AD5764的电源走线必须尽可能宽，以提供低阻抗路径，并减小电源线路上的突波效应。
The power supply traces of the AD5764 must be as wide as possible to provide low impedance paths and reduce the effects of glitches on the power supply line.
T185-C工程型LED日光灯电源出线在散热器背后，用户完全看不到电源走线，非常美观；
The outwards line of T185-C construction lamp is at the back of radiator, so users could not see any wire, which causes the nice appearance.
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