The oxygen equipment made it possible for climbers to rest very high altitudes.
The oxygen equipment made it possible for climbers to rest very high altitudes.
The reason g is smaller at high altitudes(高度) than at low is because a body weighs less at high altitudes and therefore accelerates(加速) more slowly in free fall.
The reason g is smaller at high altitudes(高度) than at low is because a body weighs less at high altitudes and therefore accelerates(加速) more slowly in free fall.
Pressurization problems are so hazardous that pilots should make an immediate descent to altitudes less than 1400 meters.
Pressurization problems are so hazardous that pilots should make an immediate descent to altitudes less than 1400 meters.
Which of the following statements correctly describes the alleviation of the effects of hypoxia at cabin altitudes about 10,000ft without the use of supplemental oxygen?
Which of the following statements correctly describes the alleviation of the effects of hypoxia at cabin altitudes about 10,000ft without the use of supplemental oxygen?
词汇与结构As the airplane transitions from cruise to landing, there can be multiple, narrow regions of altitudes and airspeeds where the vibration level can become _______
词汇与结构As the airplane transitions from cruise to landing, there can be multiple, narrow regions of altitudes and airspeeds where the vibration level can become _______
Research is under way to （） A: discover what causes the sonic boom B: find a means of eliminating the sonic boom C: produce the sonic boom at low altitudes D: reduce the sonic boom to tolerable levels
Research is under way to （） A: discover what causes the sonic boom B: find a means of eliminating the sonic boom C: produce the sonic boom at low altitudes D: reduce the sonic boom to tolerable levels