直肠长度为(  )。A.5~10cm B.12~15cm C.16~20cm

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问题 直肠长度为(  )。A.5~10cmB.12~15cmC.16~20cmD.21~25cmE.26~30cm

选项 A.5~10cm
B.12~15cm
C.16~20cm
D.21~25cm
E.26~30cm

答案 B

解析
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