单选题What will cause the ARPA to emit a visual alarm，audible alarm，or both?（）AAn acquired target entering into a guard zoneBA tracked target lost for one radar scanCA tracked target entering your preset CPA-TCPA limitsDA target being initially detected within a guard zone
单选题
What will cause the ARPA to emit a visual alarm，audible alarm，or both?（）
A
An acquired target entering into a guard zone
B
A tracked target lost for one radar scan
C
A tracked target entering your preset CPA-TCPA limits
D
A target being initially detected within a guard zone
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