| 释义 |
vacuum-tube 英'vækjuəmtj'uːb美'vækjuəmtj'uːb COCA¹⁴¹⁷⁵⁷BNC²³⁶²¹³⁺¹
基本英英记法例句
n.电子管¹⁰⁰
名词 vacuum tube:
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelopevacuum-tube⇒n.电子管用作名词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。 |