Another kind of altimeter, the radio altimeter, makes use of radio reflections. It calculates the height of the flying plane by sending out electrical signals to the surface below and measuring the time required for them to bounce back(反弹). It is correct within 15 feet over water, 1. ____________
2. ____________ An instrument used in an airplane to tell the pilot 3. ____________ of the craft.
4. ____________
5. ____________
The radio altimeter
How it works by 6. ____________ to show the altitude of the airplane, or the height above sea level by giving out 7. ____________to the surface below and measuring the time required for them to bounce back
How to 8. ____________ adjust it to the actual sealevel pressure before the plane 9. ____________.
correct it in flight according to new information.
/
Requirements within 10. ____________ within 15 feet over water
Ⅳ.写作(25 min.)根据反映亮亮一年前与现在的变化并提出自己的建议。词数不少于120。
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