...ious society calls for strengthening of medical student education in professional ethics 呼吸器 » Self-rescue apparatus 我希望有一个爱我的他 » I want a love I he ..
Personnel, includingrescueworkers, should notenterareas where the oxygenconcentration is below19.5%, unless provided with a self-contained breathingapparatus (SCBA) or airline respirator.