英语语法分析

The ointment contains polymixin B and oxytetracycline in a petroleum base.

美中不足包含在一个多粘菌素B和石油基地土霉素。

Least effective were chlortetracycline, oxytetracycline, and tetracycline.

效力最差的是金霉素、土霉素和四环素。

The method for determining oxytetracycline residues in milk by RP-HPLC was established.

建立了测定牛奶中土霉素残留的RP -HPLC方法。