在受精卵哪一期受到照射的效应,表现为显性致死性效应()。
A.着床前
B.器官形成
C.胎儿
D.着床后
E.胚胎
参考答案:A
诊断甲状腺功能亢进最有意义的体征是()。
A.浸润性突眼
B.脉压增大
C.弥漫性甲状腺肿大伴血管杂音
D.心率增快,第一心音亢进
E.双手指细颤
Finally, let’s ______ a critical issue in any honest exploration of our attitudes towards old people, namely the value which our society ascribes to them.
A. stick to B. turn to C. lead to D. take to