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valved是什么意思

valved

例句

Q 20 : Can a valved respirator be used for protection from the virus that causes H 1 N 1 influenza? 问20:可以用带呼气阀的呼吸防护口罩防甲型(H1N1)流感病毒么 ?
A large, valved, brass wind instrument with a bass pitch. 大型带活塞的低音铜管乐器.
Ostracodes are small animals, most of which have a two valved shell. 介形虫是小型动物, 其中大部份都具有两瓣的外壳.

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