亚洲网紅露点

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heptode

[ hep-tohd ]

noun

Electronics.
  1. a vacuum tube containing seven electrodes, usually a plate, a cathode, a control electrode, and four grids.
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亚洲网紅露点 History and Origins

Origin of heptode1

First recorded in 1930鈥35; hept- ( def ) + -ode 2

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heptavalentheptose

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