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词汇
evacuated tube
释义
evacuated tube
基本
例句
电子管
In a radio tube there is a source of electrons.
在电子管中,有一个电子发射源。
A tube or a transistor can amplify an incoming signal.
电子管和晶体管能放大输入的信号。
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更新时间:2025/6/16 19:40:56