Epoxidation and oxidation gave the racemic C18-juvenile hormone. 通过环氧化和氧化就得到外消旋的含十八个碳的昆虫返动激素。
Results show that the crack is mainly intergranular and there is no decarburization and oxidation at the edge of the crack. 根据齿座表面裂纹主要呈沿晶扩展,裂纹两侧无脱碳和氧化现象,认为该裂纹为淬火裂纹。