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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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.red
B.red and white
C.green
D.green and white
A.One
B.Two
C.Three
D.Four
A.white light
B.red light
C.yellow light
D.blue light
A.special flashing light
B.anchor light
C.sternlight
D.masthead light
最新試題
At sea，you are approaching a small vessel and see that it has the signal flag P hoisted. What should you do?（）.
A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.
A vessel being towed astern，where the length of the tow exceeds 200 meters，will exhibit （）.
An all-round flashing yellow light may be exhibited by a(n)（）.
An occulting light is one in which（）.
Environmental loading consists of the forces caused by wind，waves，and（）.
An inconspicuous，partly submerged vessel or object being towed，where the length of tow is 100 meters，shall show（）.
A red triangular daymark marks（）.
The prohibition against displaying lights which may be confused with required navigation lights applies（）.
A safe water daymark has what shape? （）