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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

试题出自试卷《大副航海英语题库及答案1(丙类)》

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