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A new kind of radar has been developed for spaceship travelers. A working laboratory model of a new ...

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has been    have been    has had    have had  
laser-doppler radar is more accurate than microwave radar  microwave radar may not ensure absolute precision in measuring varying speeds  the light-beam radar can measure only slow speeds with accuracy  microwave radar operates at a higher frequency than laser-doppler radar  
it is one thousand times more precise than microwave radar  it provides precise measures of the velocity of space vehicles  it is a new system of radar  it can measure the movement of a spaceship less accurately than a microwave radar  
is sold well, has sold out    is sold well, has been sold out    sells well, has sold out    sells well, has been sold out  
laser-doppler radar is more accurate than microwave radar  microwave radar may not ensure absolute precision in measuring varying speeds  the light-beam radar can measure only slow speeds with accuracy  microwave radar operates at a higher frequency than laser-doppler radar  
accuracy in speed measurement is essential to spaceships  the speeds of space vehicles will vary  inaccuracies in measurement could cause accidents in space missions  a bump could affect the preciseness of the laser-doppler radar  
Rendezvous in Space  Landing at a Space Station  New Radar for the Space Age  Space Navigation  
measures the movements of a spaceship by means of light beam  makes use of microwaves  makes use of sound waves  Both A and B  
measures the movements of a spaceship by means of light beam  makes use of microwaves  makes use of sound waves  Both A and B  
has been developed  is being developed   is developing  has developed  
has been developed    is being developed    is developing    has developed  
laser-doppler radar is more accurate than microwave radar  microwave radar may not ensure absolute precision in measuring varying speeds  the light-beam radar can measure only slow speeds with accuracy  microwave radar operates at a higher frequency than laser-doppler radar  
it is one thousand times more precise than microwave radar  it provides precise measures of the velocity of space vehicles  it is a new system of radar  it can measure the movement of a spaceship less accurately than a microwave radar  
laser-doppler radar is more accurate than microwave radar  microwave radar may not ensure absolute precision in measuring varying speeds  the light-beam radar can measure only slow speeds with accuracy  microwave radar operates at a higher frequency than laser-doppler radar  
measures the movements of a spaceship by means of light beam  makes use of microwaves  makes use of sound waves  Both A and B  
it is one thousand times more precise than microwave radar  it provides precise measures of the velocity of space vehicles  it is a new system of radar  it can measure the movement of a spaceship less accurately than a microwave radar  
measures the movements of a spaceship by means of light beam  makes use of microwaves  makes use of sound waves  Both A and B  
accuracy in speed measurement is essential to spaceships  the speeds of space vehicles will vary  inaccuracies in measurement could cause accidents in space missions  a bump could affect the preciseness of the laser-doppler radar  
accuracy ill speed measurement is essential to spaceships  the speeds of space vehicles will vary  inaccuracies in measurement could cause accidents in space missions  a bump could affect the preciseness of the laser-doppler radar  
accuracy in speed measurement is essential to spaceships  the speeds of space vehicles will vary  inaccuracies in measurement could cause accidents in space missions  a bump could affect the preciseness of the laser-doppler radar  

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