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
