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【单选题】
输尿管的第二处狭窄位于A.
肾盂与输尿管移行处
B.
跨越髂血管处
C.
与子宫动脉交叉处
D.
与腰大肌中点处
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A.
I'm sorry about that.
B.
No problem.
C.
With pleasure.
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