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【单选题】
Laser-doppler radar ______. ( )
A.measures the movements of a spaceship by means of light beam
B.makes use of microwaves
C.makes use of sound waves
D.BothA、andB
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根据网考网移动考试中心的统计,该试题:
57%
的考友选择了A选项
30%
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3%
的考友选择了C选项
10%
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