单项选择题
A vessel being towed astern，where the length of the tow exceeds 200 meters，will exhibit （）.
A.two balls in a vertical line
B.a diamond shape where it can best be seen
C.a ball on each end of the tow
D.no dayshape
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相关考题
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单项选择题
A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.
A.no fog signal
B.one short blast
C.one prolonged and three short blasts
D.one prolonged，one short，and one prolonged blast -
单项选择题
A triangular daymark would be colored（）.
A.red
B.red and white
C.green
D.green and white -
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
