单项选择题
When vessel enters thick fog, she should sound（）every two minutes in accordance with the rules.
A.one short blast B.one prolonged blast C.two short blasts
单项选择题 When there is not a chief officer on board,（）should keep and write up the ship’s logbook.
单项选择题 Which one of two crossing power-driven vessels has the right of way in a fog?（）.
单项选择题 Write down your name（）,please.
