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