（）浓度超过一定限度，特别是在密闭容器内焊接而通风不良时，可引起支气管炎、咳嗽、胸闷等症状。B
A、氮氧化物
B、臭氧
C、一氧化碳
参考答案：B
交流单相回路的电力电缆，( )有未经非磁性处理的金属带、钢丝铠装。
A．不得
B．可
C．应
D．宜
A client reports losing his job, not being able to sleep at night, and feeling upset with his wife. The nurse responds to the client, "You may want to talk about your employment situation in group today. " The nurse is using which therapeutic technique
A．Restating.
B．Making observations.
C．Exploring.
D．Focusing.
