Pressurization problems are so hazardous that pilots should make an immediate descent to altitudes less than 1400 meters.
举一反三
- How large is Pit No. 1 of the Terracotta Army? A: With an area of more than 14,000 square meters and is the largest pit. B: B. With an area of more than 10,000 square meters. C: C. With an area of more than 5,000 square meters. D: D. Less than 5,000 square meters.
- Normally, the distance between the approach and the main signal is no less than _______ meters.
- 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 maximum height _________ the grotto is 40 meters, and the width is 30 meters, while the minimum height of the grotto is less than an inch. A: with B: of C: on
- In Singapore, nearly two-thirds of the main island is less than 15 meters above sea level.