Based on solid phosphoric acid catalyst (SPAC) T 49 composed of Si P B ternary system a new SPAC T 99 composed of Si P B D quaternary system was developed.是什么意思_Based on solid phosphoric acid catalyst (SPAC) T 49 composed of Si P B ternary system a new SPAC T 99 composed of Si P B D quaternary system was developed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句