缓(控)释制剂生物利用度研究对象选择例数为
A.6~9例
B.8~12例
C.12~16例
D.18~24例
E.24~30例
参考答案:D
I felt unhappy because I failed the exam. Which part of the sentence is the underlined word?
A adverbial B predicative C object D predicate
中国新民主主义革命胜利的基本经验有哪些?