______ is not a job of the radar antenna．A.To receive the high-frequency pulses from the transmitterB.To focus the pulses into a beam，and send them into spaceC.To pick up reflected pulses coming from objects that have been struck by the beamD.To reflect microwaves
______ is not a job of the radar antenna．
A.To receive the high-frequency pulses from the transmitter
B.To focus the pulses into a beam，and send them into space
C.To pick up reflected pulses coming from objects that have been struck by the beam
D.To reflect microwaves
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