英语语法分析

Tetracaine was used as a internal standard.

选择丁卡因作为内标准品。

OBJECTIVE To study the stability and expiration of tetracaine hydrochloride injection.

目的研究盐酸丁卡因注射液的稳定性及贮存期。

OBJECTIVE to study the methods of preparation of hydrochloride tetracaine liposome and liposome gel and to determine the liberation of drug from them.

目的研究盐酸丁卡因脂质体以及脂质体凝胶的制备方法，并考察脂质体及脂质体凝胶对药物释放的影响。