brown coal wax是什么意思

用法例句

The free acid, combined acid, alcohol and hydrocarbon fractions in brown coal resin, separated from Zhaotong brown coal wax (Yunnan Province), were studied on gas chromato- graphy-mass spectrometer.

对云南昭通褐煤蜡树脂中游离酸、结合酸、树脂醇、树脂烃进行了GC-MS研究。