更多"Laser-dopple radar is especially va"的相关试题:
[单项选择]Laser-doppler radar is especially valuable in space missions because ______. ( )
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
[单项选择]With the help of the space-shuttle-carried radar, archeologists found
A. a new stretch of the Sahara desert.
B. traces of ancient riverbeds under the Sahara Desert.
C. some traditional archeological tools in the Sahara Desert.
D. a mountain beneath the Sahara Desert.
[单项选择]The installation of radar is supposed to keep track of airlines in the __________.
A. velocity
B. proximity
C. terrain
D. vicinity
[单项选择]By moving the radar beam around slowly in circles, we can ______ the surroundings.
A. explore
B. expose
C. exploit
D. expand
[单项选择]Without the radar receiver, the large antenna(无线) ______ of no use.
A. would be
B. will be
C. be
D. was
[单项选择]Laser-dopple radar ______.
A. measures the movement of a spaceship by means of light beam
B. makes use of microwaves
C. makes use of sound waves
D. both A and B
[单项选择]Radar enabled the English ______.
A. detect German planes on their way to London
B. direct the outnumbered RAF planes effectively
C. confuse German bomber pilots
D. both A and B
[单项选择]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. Both A and B
[单项选择]Cooked vegetables are also valuable sources of certain vitamins and minerals, if the juice is eaten and if not cooked ______ .
A. too long a time
B. a long time too
C. much time long
D. long much time
[单项选择]The doctor in Singapore performed a valuable service by ______.
A. finding the subgroup of the virus
B. developing a cure
C. keeping his patients apart from others
D. reporting the outbreak to W. H. O.
[单项选择]The author suggests that the most valuable resource in today's society is _________.
A. access to information
B. economic assets
C. technology
D. time
[单项选择]Radar is used to extend the （）of man's senses for observing his environment, especially the sense of vision.
A. validity
B. liability
C. capacity
D. intensity
[单项选择]How many equal valuable relation does set E process E= {0,1,2}
A. 3
B. 4
C. 5
D. 6
[单项选择]What the reporter stole would have been valuable to ______.
A. another computer firm
B. a rich criminal
C. an export agency
D. a rival company
[单项选择]Defeat is valuable______.
A. because it makes you fail
B. because it forces you to face it
C. because it gives the guide and encouragement to success
D. because of your own refusal to see in it the guide and encouragement to success
[单项选择]Washington's teapot is more valuable as antiques because ______.
[单项选择]The valuable curiosity he bought turns out to be fake for it does not ______ ciose examination.
A. pat up
B. stand up
C. set up
D. look up
