หวยซอง จอมขมังเวทย์ ชุดบน ล่าง งวดนี้ 02 พฤษภาคม 2562 ขอให้โชคดี-เลขเด็ด งวดนี้
Pilots have known the need for monitoring this oxygen levels for almost a hundred years now. As aircraft climb in altitude, the oxygen levels drop. This is a very dangerous effect if not counteracted. For this reason, it is necessary for pilots in the navy and air force has oxygen masks. It is also necessary for commercial airlines to train their employees on the use of supplemental oxygen. This training includes the procedures for supplying supplemental oxygen for passengers in the event of an emergency. Oxygen masks are not provided for aviation pilots on commercial airlines, because of the general design and set up on commercial airliners. For this reason, a pulse oximeter has become a great tool for pilots.
from: http://ezinearticles.com/?Pulse-Oximeter-Used-in-Aviation&id=5554782
