高处作业区周围的孔洞、沟道等应设盖板、安全网或围栏并有固定其位置的措施。同时应设置安全标志,夜间还应设()示警。
查看答案
What can we infer from the second paragraph？
A. Human-resources people are preferred to the recruit the students of elite universities.
B. The revenue-generating staff is more efficient in recruiting students.
C. The staff of recruiting is the most decisive factor in elite recruiting.
D. Students in elite universities will spend a lot to win the recruitment season.
杆塔顶部吊离地面约()m时,应停吊进行冲击实验。
A. 0.8
B. 1
C. 1.2
钢丝绳绳卡之间的距离应为()倍的钢丝绳直径。
A. ≥5
B. ≥6
C. ≥7
杆塔起立约()°时应减慢牵引速度,约80°时应停止牵引,利用临时拉线将杆塔调正、调直。
A. 50
B. 60
C. 70
微信支付 
支付宝支付