單項選擇題A vessel towing is showing three forward white masthead lights in a vertical line. This means that the length of the（）.

A.towing vessel is less than 50 meters
B.towing vessel is greater than 50 meters
C.tow is less than 200 meters
D.tow is greater than 200 meters


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1.單項選擇題A vessel is fishing at anchor on the high seas. Which of the following day signals should she display if she has gear extending out over 150 meters horizontally from the vessel?（）.

A.A black ball in the forepart of her vessel
B.A black double frustum of a cone
C.A basket where best seen
D.A black cone point upwards

2.單項選擇題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

3.單項選擇題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

4.單項選擇題A triangular daymark would be colored（）.

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