尿瘘发生的主要原因是（）
A.产伤和手术损伤
B.膀胱病变
C.泌尿系感染
D.子宫托长期放置
E.放疗后损伤
参考答案：A
______ his drunk driving, he was _______ from driving for two years.[ ]
A. Thanks to; stopped
B. Due to; kept
C. Owing to; banned
D. Because of; forbidden
合金结构钢主要是（）
A.低合金结构钢
B.合金渗碳钢和合金弹簧钢
C.合金调质钢和滚珠轴承钢
D.A+B+C
