题目内容
（请给出正确答案）
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
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更多“Radar enabled the English ____…”相关的问题
Implied but not stated ______ .
A．Laser-dopple radar is more accurate than microwave radar
B．Microwave radar may not ensure absolute precision in measuring varying speeds
C．The light-beam radar can measure only slow speeds with accuracy
D．Microwave radar operates at a higher frequency than laser-dopple radar
Laser-dopple radar is especially valuable in space missions because it ______ .
A．is one thousand times more precise than microwave radar
B．provides precise measures of the velocity of space vehicles
C．is a new system of radar
D．can measure the movement of a spaceship less accurately than a microwave radar
Which type of waves does radar use？
A．Sound.
B．Heat.
C．Radio.
D．Light.
Laser-dopple radar is especially valuable in space missions because it ______.
A．is one thousand times more precise than microwave radar
B．provides precise measures of the velocity of space vehicles
C．is a new system of radar
D．can measure the movement of a spaceship less accurately than a microwave radar
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.
Implied but not stated ______.
A．Laser-dopple radar is more accurate than microwave radar
B．Microwave radar may not ensure absolute precision in measuring varying speeds
C．The light-beam radar can measure only slow speeds with accuracy
D．Microwave radar operates at a higher frequency than laser-dopple radar
Radar is used to determine the characteristics of radiocarbon.
A．Right
B．Wrong
C．Not mentioned
