胆道疾病放射学检查中属逆行性检查方法的是()
A.静脉胆道造影
B.PTC
C.ERCP
D.电子计算机体层扫描
E.术中胆管造影
参考答案:C
The city ____ by an army of 600 men was difficult to take.
A.defending
B.to defend
C.having defended
D.defended
美国风湿病协会将RA关节功能障碍分为()
A.Ⅴ级
B.Ⅲ级
C.Ⅱ级
D.Ⅰ级
E.Ⅳ级