n free surface
N自由面
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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