LigninsCOCA²⁴⁰⁶⁸⁷BNC²³⁶²¹³⁺¹ 基本例句 木素,木质素原型lignin的复数 The chemical groups and bonds characterization of lignins obtained from juvenile and mature of Chinese Fir were studied by elemental analysis, FTIR and1H NMR spectroscopy. 采用有机元素分析、红外光谱、质子核磁共振波谱对从杉木幼龄材和成熟材中提取的磨木木质素的化学官能团和化学键特征进行了研究。 cnki