不道德的人体实验是()
A.天然实验
B.自体实验
C.欺骗实验
D.自愿实验
参考答案:C
Henry hurried to the library, only to find a notice at the gate, saying “No___________before 12:00 noon”.
A.permission
B.commitment
C.possession
D.admission
牙根形成的多少取决于
A.成釉器B.牙 * * C.牙囊D.上皮根鞘E.上皮隔