钢结构材料常用的切割方法有( )。
A. 机械剪切
B. 气割(正确答案)
C. 等离子切割(正确答案)
D. 线切割(错误答案)
钢结构涂装施工应在除锈后_________h内进行,严禁在表面无处理且有污染、赃物、浮锈的情况下进行涂装作业。
A. 2
B. 4
C. 6
D. 8
In US children goafter kindergarten.
A. Elementary school
B. Primary school
C. Nursery
Daycare
In UK they also call secondary school a
A. Uni
B. University
C. college
D. institution