偏瘫患者常出现的异常步态是（）
A.划圈步态
B.鸭子步态
C.跨阈步态
D.剪刀步态
E.扶膝步态
参考答案：A
To his disappointment, not a single gift _____ on his birthday.
A．he received
B．had he received
C．did he receive
D．received he
当工序尺寸未注公差时，夹具公差通常取为（）。
A.±0.01
B.±0.02
C.±0.05
D.±0.10
