单选题You are underway and approaching a bend in the channel where vessels approaching from the opposite direction cannot be seen．You should sound（）.Aone blast，4 to 6 seconds in durationBthree blasts，4 to 6 seconds in durationCone continuous blast until you are able to see around the bendDone blast，8 to 10 seconds in duration
单选题
You are underway and approaching a bend in the channel where vessels approaching from the opposite direction cannot be seen．You should sound（）.
A
one blast，4 to 6 seconds in duration
B
three blasts，4 to 6 seconds in duration
C
one continuous blast until you are able to see around the bend
D
one blast，8 to 10 seconds in duration
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