单项选择题
A.接头前膜和接头后膜B.接头后膜和接头间隙C.接头前膜、接头后膜和接头间隙D.接头前膜和接头间隙E.接头前膜、接头后膜和接头缝隙
A.尿道B.膀胱C.肾盂D.输尿管E.肾
A.黏膜、肌层、外膜B.黏膜、黏膜下层、外膜C.黏膜、黏膜下层、肌层D.黏膜下层、肌层、外膜E.黏膜、黏膜肌层、外膜