英语翻译.按1:7的比例加入试剂,介词用in 还是用with 或者是at?

问题描述:

英语翻译.按1:7的比例加入试剂,介词用in 还是用with 或者是at?

淡淡的淡淡的淡淡的

at the ration of 1:7.

in proportion of 1 to 7 下面是例句:方法: 用壳聚糖和羧甲基壳聚按3:1的比例采用冷冻干燥法制成壳聚糖复合导管;Methods: Complex chitosan conduits were made from chitosan and carboxymethylchitosan by fre...

in a 1:7 ratio