This selection could be entitled______.
A. The Function of Radar
B. Problems in Space Navigation
C. Radar for the Space Age
D. Space Stations
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设随机变量X与Y相互独立,且分别服从参数为1与参数为4的指数分布,则P|x<y|=().
A. 1/5
B. 1/3
C. 2/5
D. 4/5
Which of the following statements is implied but not stated?
A. Microwave radar operates at a higher frequency than laser-doppler radar.
B. Laser-doppler radar is more accurate than microwave radar.
C. The light-beam radar can measure only slow speeds with absolute accuracy.
D. Microwave radar does not insure absolute precision in measuring varying speeds.
The author's attitude toward Paul Revere is______.
A. amused
B. respectful
C. distant
D. serious
We are told that adders were______.
A. not afraid of human beings
B. aggressive towards anyone in their territory
C. unlikely to bite except in self-defense
D. normally friendly towards people