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

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

出自：海船船员证

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