药物透皮吸收是指
A. 药物通过表皮到达深层组织
B. 药物主要作用于毛囊和皮脂腺
C. 药物在皮肤用药部位发挥作用
D. 药物通过表皮，被毛细血管和淋巴细胞吸收进入人体循环的过程
E. 药物通过破损的皮肤，进入人体内的过程
It can be inferred from the passage that by 1870 ______.
A. the steam engine had been invented
B. a national commission on agriculture had been established
C. the U.S. horse population was about 10 million
D. technology began to be more economical
茶碱在乙二胺存在下溶解度由1:120增大至1:5，乙二胺的作用是
A. 增大溶液pH值
B. 矫味
C. 助溶
D. 增溶
E. 防腐
Which of the following is not TRUE of the investigation
A. It will last at least 7 years.
B. Cooperation from the mothers is also necessary.
C. Some independent observers play a part.
D. Researchers paid site visits to see a caretaker's personality and kids' emotional reaction.
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