To determine if risk of collision exists，a vessel which is fitted with radar must use（）.<br>A:radar scanning<br>B:radar plotting<br>C:compass bearings<br>D:All of the above

To determine if risk of collision exists，a vessel which is fitted with radar must use（）.
A:radar scanning
B:radar plotting
C:compass bearings
D:All of the above

出自：海船船员证

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