单选题The closest point of approach (CPA) of a contact on a relative motion radar may be determined（）.Aimmediately when the contact is noted on radarBonly if the radar scope is watched constantlyCafter the contact has been marked at least twiceDby an occasional glance at the radar
单选题
The closest point of approach (CPA) of a contact on a relative motion radar may be determined（）.
A
immediately when the contact is noted on radar
B
only if the radar scope is watched constantly
C
after the contact has been marked at least twice
D
by an occasional glance at the radar
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