If you do NOT understand the course or intention of an approaching vessel you should sound （）.<br>A:one short blast<br>B:one prolonged blast<br>C:not less than five short blasts<br>D:not less than five prolonged blasts

If you do NOT understand the course or intention of an approaching vessel you should sound （）.
A:one short blast
B:one prolonged blast
C:not less than five short blasts
D:not less than five prolonged blasts

出自：海船船员证

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