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【单选题】
下列哪项不是PTH过低引发的病理生理改变?A.
破骨作用减弱，骨吸收降低
B.
1,25(OH)2-D3形成减少而肠道钙吸收减少
C.
肾小管钙重吸收增加而尿钙排出减少
D.
尿cAMP降低，但注射外源性PTH后，尿 cAMP立即上升
E.
肾排磷减少，血清磷增高
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【单选题】听力原文：W: Excuse me, Dr. Chandler, do you have a moment? I want W talk about the topic of my paper. M: Of course, what can I do for you, Sienna? W: I want to change the topic of my paper. You know I was...
A.
She wants to type up a biography about her uncle.
B.
She would like to find an interesting job working at NASA.
C.
She would like to introduce him to a recently retired astronaut.
D.
She wants to write a man who once worked in the U. S. space program.
【单选题】听力原文：W: Excuse me, Dr. Chandler, do you have a moment? I want W talk about the topic of my paper. M: Of course, what can I do for you, Sienna? W: (19) I want to change the topic of my paper. You know ...
A.
She wants to type up a biography about her uncle.
B.
She would like to find an interesting job working at NASA.
C.
She would like to introduce him to a recently retired astronaut.
D.
She wants to write a man who once worked in the U. S. space program.
【简答题】市场机制引入医学实践时最易带来医务人员拜金主义问题是由于市场经济具有（ ）
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