單項選擇題At sea，you are approaching a small vessel and see that it has the signal flag P hoisted. What should you do?（）.

A.Proceed on present course and speed since the vessel is stopped and making no way through the water
B.Keep clear of the vessel because it has a diver down
C.Attempt to call the vessel on VHF radiotelephone because someone on board requires medical assistance
D.Approach with caution because the vessel is a fishing vessel and its nets are fouled on an obstruction


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1.單項選擇題As defined in the Rules，a towing light is a yellow light having the same characteristics as a(n)（）.

A.masthead light
B.all-round light
C.sidelight
D.sternlight

2.單項選擇題Approaching an anchorage in fog，you hear one short，one prolonged，and one short blast in that sequence on a ship’s whistle． This indicates（）.

A.A vessel towed
B.A vessel not under command and unable to maneuver
C.A vessel anchored giving warning of her position
D.A vessel stopped dead in the water

3.單項選擇題An occulting light is one in which（）.

A.the period of darkness exceeds the period of light
B.there is only a partial eclipse of the light
C.the periods of light and darkness are equal
D.the period of light exceeds the period of darkness

4.單項選擇題An inconspicuous，partly submerged vessel or object being towed，where the length of tow is 100 meters，shall show（）.

A.yellow lights at each end
B.two red lights in a vertical line
C.a black ball
D.a diamond shape

5.單項選擇題An all-round flashing yellow light may be exhibited by a(n)（）.

A.vessel not under command
B.air cushion vessel in the nondisplacement mode
C.vessel towing a submerged object
D.vessel engaged in diving operations