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发布时间: 1970-01-01

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1最佳选择题 3分

Anewkindofradarhasbeendevelopedforspaceshiptravele

  • A. measures the movements of a spaceship by means of light beam
  • B. makes use of microwaves
  • C. makes use of sound waves
  • D. Both A and B
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正确答案: -

本题解析: 暂无解析

2最佳选择题 3分

Anewkindofradarhasbeendevelopedforspaceshiptravele

  • A. it is one thousand times more precise than microwave radar
  • B. it provides precise measures of the velocity of space vehicles
  • C. it is a new system of radar
  • D. it can measure the movement of a spaceship less accurately than a microwave radar
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正确答案: -

本题解析: 暂无解析

3最佳选择题 3分

Anewkindofradarhasbeendevelopedforspaceshiptravele

  • A. accuracy in speed measurement is essential to spaceships
  • B. the speeds of space vehicles will vary
  • C. inaccuracies in measurement could cause accidents in space missions
  • D. a bump could affect the preciseness of the laser-doppler radar
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正确答案: -

本题解析: 暂无解析

4最佳选择题 3分

Anewkindofradarhasbeendevelopedforspaceshiptravele

  • A. laser-doppler radar is more accurate than microwave radar
  • B. microwave radar may not ensure absolute precision in measuring varying speeds
  • C. the light-beam radar can measure only slow speeds with accuracy
  • D. microwave radar operates at a higher frequency than laser-doppler radar
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本题解析: 暂无解析

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