摘要： The barometer altimeter won't work if the plane flies . A. beyond the atmosphere B. above very high land C. over very uneven ground D. with 1,000 feet of the ground 3. Suppose a plane using a radio altimeter is flying 10,000 meters above a highland which is 4,000 meters above the sea level. What reading will be given by the altimeter? A.10,000 meters. B.4,000 meters. C.14,000 meters. D.6,000 meters. 4. Suppose a plane using both kinds of altimeters is flying over a mountainous area where the land rises and falls very abruptly. The pilot keeps his plane steady at the same height. Which kind of reading will you get on each of the altimeters? A. The readings on both altimeters will remain steady. B. The readings on both altimeters will rise and fall abruptly. C. The reading on the barometer altimeter will rise and fall abruptly, while that on the radio altimeter will remain steady.

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