positive-action valve是什么意思，positive-action valve的翻译，positive-action valve音标、读音、用法和例句

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positive-action valve是什么意思，positive-action valve的翻译，positive-action valve音标、读音、用法和例句_淳朴汉英词典

positive-action valve

基本解释

专业释义

交通运输工程