题目内容

A SART will generates a series response signals when it _________.

A. is put into water upright
B. generates visual and audible indication
C. is being interrogated by 9GHz shipborne or airborne radar
D. is along its line of bearing and extends on 8nm outward from its position

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ADE
B. GMDSS
C. NBDP
DSC

A. 2187.5 kHz
B. 2174.5 kHz
C. 2182kHz
D. 2177.0kHz

A. channel
B. frequency
C. antenna height
D. weather

A. Distress communications
B. Traffic Lists.
C. Vessel position information to ship owners.
D. GPS relays.