“次级”怎么读？

“次级”的英语可以翻译为：secondary ...

醇和醛两者为氧化的次级产物.Both the alcohols and aldehydes are secondary products of the oxidation.当次级电路开路时, 铁芯磁通量仅仅由初级电流产生.When the secondary circuit is open, the core flux is produced by the primary current only.群系可以按其优势物种的特征划分为一些次...