Vacuum tube 真空管/电子管
摘要：
真空管/电子管的发明 1904, John Ambrose Fleming invented the two-electrode vacuum-tube rectifier, which he called the oscillation valve. It was also called a th 阅读全文
posted @ 2018-02-20 00:31 Milton 阅读(1065) 评论(0) 推荐(0)
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