单项选择题
A.正常胆总管直径<5mm,>8mm为扩张 B.正常胆总管直径<8mm,>10mm为扩张 C.正常胆总管直径<10mm,>15mm为扩张 D.正常胆总管直径<15mm,>20mm为扩张 E.以上都不对
A.<1mm B.<2mm C.<3mm D.<4mm E.<5mm
A.6mm B.8mm C.10mm D.12mm E.14mm