先天性髋脱位病理改变有()
A．髋臼发育不良
B．股骨头发育差
C．髋臼软组织挛缩
D．关节囊拉长或呈葫芦形
E．脊柱侧弯
参考答案：A,B,C,D
Apple Inc co-founder and former CEO Steve Jobs died on Wednesday at the age of 56,
after a years-long and highly public battle ____ cancer．[ ]
A. in
B. by
C. with
D. through
当加工一凹模时，编程方向是顺时针，采用的偏移指令是（）。
A、G40
B、G41
C、G42
D、G52
