单选题Underway vessels shall at all time maintain a proper look-out（）.Aby sight and hearing onlyBby all available means besides sight and hearingCby all available means except sight and hearingDby none of above means
单选题
Underway vessels shall at all time maintain a proper look-out（）.
A
by sight and hearing only
B
by all available means besides sight and hearing
C
by all available means except sight and hearing
D
by none of above means
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