单项选择题
A.no fog signal B.one short blast C.one prolonged and three short blasts D.one prolonged，one short，and one prolonged blast
A triangular daymark would be colored（）.A.redB.red and ...
单项选择题A triangular daymark would be colored（）.
A.red B.red and white C.green D.green and white
A towing vessel 30 meters in length is pushing barges a...
单项选择题A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）
A.One B.Two C.Three D.Four
A towing light，according to the Rules，is a（）.A.white li...
单项选择题A towing light，according to the Rules，is a（）.
A.white light B.red light C.yellow light D.blue light
