I hope you will spend as much time as you can ________ your English.
A. to practice
B. practice
C. practicing
D. on practice
查看答案
防坠落用品与登高器具、设备要()用
A. 酌情
B. 随意
C. 正确
The foreigners _________there, but they _________the food there at first.
A. u sed to live, didn ’t be used to
B. are used to living, didn ’t use to
C. used to live , weren ’t used to
D. used to living, usedn ’t to
作业环境空气质量合格率ηk、有效风量率ηu合格标准为()%
A. ≥65
B. ≥60
C. ≥70
拆除柱子,应沿柱子底部剔凿出钢筋,使用手动倒链定向牵引,采用气焊切割柱子三面钢筋,保留牵引方向正面的钢筋()