Application of ion exchange technology in the purification, epimerization analysis and detection of sugar was introduced.阐述了离子交换技术在糖的纯化 、 差向异构化及分析检测方面的应用....
The mends were almost invisible.补好的地方几乎看不出来.A plumber is a person who fits and mends the plumbing.管子工是安装和修理水管的人.The mends on your coat were almost invisible.你外套上的补钉简直看不出来....