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The basic principle of radar is illustrated by what happens when one shouts in a cave. The echo of the shouting (11)______ the
The basic principle of radar is illustrated by what happens when one shouts in a cave. The echo of the shouting (11)______ the
admin
2009-01-10
21
问题
The basic principle of radar is illustrated by what happens when one shouts in a cave. The echo of the shouting (11)______ the walls helps a person determine the size of the cave. With radar,however,the waves are radio waves instead of (12)______ waves. Radio waves travel (13)______ the speed of light,about300,000 kilometers in a second. A radar set (14)______ a short burst of radio waves. Then it receives the echoes (15)______ when the waves bounce(反射) off objects. By determining the time it (16)______ for the echoes to return to the radar set,a trained technician (17)______ determine the distance between the radar set and other objects. The word“radar”, (18)______ ,gets its name from the term“radio detection and ranging. ”“Ranging”is the term for detection of the (19)______ between an object and the radar set.
Besides being of critical importance to pilot,radar is (20)______ for air traffic control,for tracking ships at sea,and for tracking weather systems and storms.
选项
A、can
B、must
C、ought to
D、has to
答案
A
解析
仅仅表示一种“能”的意愿、能力。故选A。
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