CDFI检测输尿管膀胱开口处结石的特点是：①输尿管膀胱开口喷尿频率减少②输尿管膀胱开口喷尿尿流变短③输尿管膀胱开口喷尿消失④输尿管膀胱开口喷尿频率增多⑤输尿管膀胱开口喷尿尿流变粗

A.①②③

B.④⑤

C.③

D.②③