The contact angles of formamide on the carbon fibres under n-alkane were measured by means of electrobalance and the surface free energy and its components of the fibres were obtained.
用电子天平法，以正烷烃-甲酰胺-炭纤维体系间接地求得了炭纤维的表面自由能及其分量。
2
The test results of 30 samples collected in 4 wells indicate that the abundance and extractable contents of organic matter in the coal measures are both high, nalkane possesses odd even predominance;