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[主观题]
Implied but not stated is that ______. （)A．laser-doppler radar is more accurate than micr
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
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