电弧焊工在以下（）地方的动火属于一级动火。
A.大型油罐
B.受压容器
C.地下室
D.高处焊割（登高作业）
参考答案：A, B, C
Peter could hardly see the words on the blackboard,______________? [ ]
A. did he
B. couldn't he
C. didn't he
D. could he
躯体性应激源同心理社会文化应激源一样可以引起心理反应。
ard,______________? [ ]