鸭步见于（）
A.髋关节结核
B.双侧臀中、小肌麻痹
C.髋内翻
D.先天性双侧髋关节脱位
E.化脓性髋关节炎
参考答案：B, C, D
Not until then _____ their marriage was breaking up because they had little in common.
A．did I realize
B．I realized
C．had I realize
D．has I realized
补焊机床床面，焊后需加工，应选用（）冷焊铸铁焊条。
A、Z208
B、Z308
C、Z248
D、Z116
