If there is sufficient sea room，alteration of（）may be the most effective action to avoid close-quarters situation.<br>A:speed and course<br>B:speed alone<br>C:course alone<br>D:speed or course

If there is sufficient sea room，alteration of（）may be the most effective action to avoid close-quarters situation.
A:speed and course
B:speed alone
C:course alone
D:speed or course

出自：海船船员证

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