髋关节脱位可能并发
A．骨折
B．神经损伤
C．血管损伤
D．股骨头缺血坏死
E．创伤性关节炎
参考答案：A,B,C,D,E
The boy became fatter and fatter each day and ＿＿＿made his parents sad.
A．which
B．what
C．he
D．it
在电路中选取的参考点又叫（）。
A、电动势
B、零电位点
C、高电压
D、电流
