我国手术治疗癌病的最早记载为哪部医著
A.《内经》B.《外科大成》C.《景岳全书》D.《晋书》E.《圣济总录》
参考答案:D
金首饰以纯度千分数(K数)前冠以()、()或G,来表示其纯度。
During the first 3 months, which hormone is responsible for maintaining pregnancy
A.Human chorionic gonadotropin (HCG).
B.Progesterone.
C.Estrogen.
D.Relaxin.