新生儿的药物吸收速率取决于()
A.药物剂量和药物性质
B.给药方式和药物性质
C.药物剂型和药物性质
D.药物剂型和药物剂量
E.药物剂型和给药方式
参考答案:B
The trip cost us _____ 2000 yuan. [ ]
A. as many as
B. as much as
C. so much as
D. so many as
实验室中有两瓶失去标签的无色溶液,只知道它们是氯化钠溶液和稀硫酸.应用你所学化学知识,试写出三种能分别将两溶液鉴别开的化学试剂(要求三种方法实验现象不同):
①______;②______;③______.