双杆立好后,迈步偏差不应大于()mm。
A.30
B.50
C.60
D.80
参考答案:A
The thief took off his shoes when he slipped into the house in order to steal something ___.
A.unnotice
B.unnoticed
C.unnoticing
D.to unnotice
进线装置没有使用合格的密封胶圈属于不完好。()