The coordination states of Al species in calcined HZSM-5 were investigated using 29Si, 27Al MAS NMR and 2D MQMAS.是什么意思_The coordination states of Al species in calcined HZSM-5 were investigated using 29Si, 27Al MAS NMR and 2D MQMAS.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句