单项选择题
A.肾盂分离中间为液性暗区 B.肾盂分离中间为液性暗区,液性暗区与输尿管相通 C.肾盂分离中间为液性暗区,液性暗区与输尿管相通,液性暗区不相通 D.肾盂分离中间为液性暗区,液性暗区与输尿管相通,液性暗区互不相通,液性暗区液腔饱满 E.肾盂分离中间为液性暗区,液性暗区与输尿管相通,液性暗区液腔饱满