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