单选题Which procedure(s) shall be used to determine risk of collision? （）AWatching the compass bearing of an approaching vesselBSystematic observation of objects detected by radarCLong-range radar scanningDAll of the above
单选题
Which procedure(s) shall be used to determine risk of collision? （）
A
Watching the compass bearing of an approaching vessel
B
Systematic observation of objects detected by radar
C
Long-range radar scanning
D
All of the above
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