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If you do NOT understand the course or intention o...

海船船员考试

单选题

If you do NOT understand the course or intention of an approaching vessel you should sound （）.

发布日期：2021-03-22

A.one short blast

B.one prolonged blast

C.not less than five short blasts

D.not less than five prolonged blasts

标签： understand intention approaching vessel sound

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