英语词汇“hard tube”的读音、翻译、释义、用法及例句-范文网

词汇	hard tube
释义	hard tube高真空电子管。hard: adj. 1.硬的，坚固的 (opp. soft)。 2 ...tube: n. 1.管，筒；颜料管。 2.管状地下隧道；〔口语〕( ...
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