JQ Roof Ventilators are composed of framework, protection plates, water proofing part, valves, conductor plate, drains, automatic or manual switches.是什么意思_JQ Roof Ventilators are composed of framework, protection plates, water proofing part, valves, conductor plate, drains, automatic or manual switches.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句