Virtually all receivers in use today employ Armstrong's super heterodyne concept.
Virtually all receivers in use today employ Armstrong's super heterodyne concept.
实际上所有接收器在使用中今天使用阿姆斯壮的超级外差概念。
Virtually all receivers in use today employ Armstrong's super heterodyne concept.
实际上所有接收器在使用中今天使用阿姆斯壮的超级外差概念。