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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

A triangular daymark would be colored（）.

A.red
B.red and white
C.green
D.green and white