电缆井、隧道内工作或隧道内长距离巡视时，应进行持续检测，发生报警应立即戴（）撤离现场。
A.自救呼吸器
B.紧急逃生呼吸器
C.气体检测仪
参考答案：A
Alexander tried to get his work _______in the medical circles.
A．to recognize
B．recognizing
C．recognize
D．recognized
确定计算负荷有何意义？
