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 ______      ___      _  _     ______            
|      \\   / _ \\   | \| ||  /_   _//     ___   
|  --  //  / //\ \\  |  ' ||   -| ||-     /   || 
|  --  \\ |  ___  || | .  ||   _| ||_    | [] || 
|______// |_||  |_|| |_|\_||  /_____//    \__ || 
`------`  `-`   `-`  `-` -`   `-----`      -|_|| 
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發送短信 : Deign and build step-down switching regulator