1954 年的矿石收音机，Medium, Long Wave and Short Wave designs. 12 different circuits to suit all areas and conditions. Last published in 1964. The Boys Book Of Crystal Sets 预览： 来源：矿石收音机论坛 - 1954 年的矿石收音…
如题，一篇关于电机建模的文章（1928 年），文章标题：Definition of an Ideal Synchronous Machine and Formula for the Armature Flux Linkages。 文章价值：将坐标变换应用到电机建模中，简化建模并反映本质。Park, R.H. "Definition of an ideal…
