The main materials to such as isocyanate, polyol, blowing agent and foam stabilizer et al, prepare rigid polyurethane foam are introduced.是什么意思_The main materials to such as isocyanate, polyol, blowing agent and foam stabilizer et al, prepare rigid polyurethane foam are introduced.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句