thou=mil(旧式为"mil",现在IPC 标准为"thou" 或"thousandth")mil可能大家就比较熟悉了吧,Protel 99 单位还是用mil/mmthou是英制单位,叫做毫英寸,th为thou的简写。1th=25.4X10(-3次方)mm,即1mm=39.3701th
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