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更多“microwave（）”相关的问题
All the following examples are high tech except ______.
A．a microwave oven
B．a home computer
C．a hand pump
D．a satellite.
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
Implied but not stated is that ______. ()
A．laser-doppler 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-doppler radar
A.红外烤箱中的红光就是红外线
B.红外线比可见光更容易发生衍射
C.高温物体辐射红外线，低温物体不辐射红外线
D.红外线比可见光更容易引起固体物质分子共振
