搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1型题

地方性甲状腺功能减低症的原因是（）

A.孕妇饮食中缺乏碘

B.孕妇患甲状腺炎

C.孕妇血液中有抗体

D.孕妇服用甲状腺素

E.孕早期病毒感染

答案

参考答案：A

单项选择题

卵泡早期和黄体期雌激素和孕激素对下丘脑一垂体系统呈现

A．正反馈

B．超短反馈

C．既有负反馈又有正反馈

D．负反馈

E．短反馈
查看答案
单项选择题

A painter has painted one-third of a rectangular wall which is ten feet high. When she has painted another 75 square feet of wall, she will be three-quarters finished with the job. What is the length (the horizontal dimension) of the wall

A．18 feet

B．12 feet

C．10 feet

D．9 feet

E．(E) 6 feet
查看答案