人体活动范围最大的关节是（）。
A.肩关节
B.肘关节
C.髋关节
D.膝关节
E.踝关节
参考答案：A
As for the influence of Internet, nowhere ( ) the results more clearly than in the US.
A．we have seen
B．we had seen
C．seen we have
D．have we seen
概算定额又称作( )定额。
A．台班
B．扩大结构
C．人工
D．机械
