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

时间:2022-10-02 14:20:58 所属题库:雷达及ARPA的使用题库

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