单项选择题

PPI is（）.

A.a plan-position indicator system
B.pulse-plan integration
C.pulse-pulse input
D.power-plan input

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单项选择题
Although manual plotting for CPA works well，the workload can become overwhelming when confronted with（）.

A.one target
B.two targets
C.three targets
D.a large number of targets
单项选择题
（）typically extends from close as 0.1 nautical miles out to 32 NM.

A.EBL
B.VRM
C.CRT
D.target tracking range
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