短语词组短语n - alkae 正构烷烃distribution of n -alkane 正烷烃分布shorter train n -alkane 短链烷烃GC fingerprint of n -Alkane 正构烷烃气相色谱指纹法prary alcohol -n-alkane system 伯醇high molecular weight n -alkane 高相对分子质量正烷烃 返回 n-alkane