单项选择题

By night，you sight the lights of a vessel engaged in underwater operations. If an obstruction exists on the port side of the vessel，it will be marked by（）.

A.a floodlight
B.two red lights in a vertical line
C.a single red light
D.any visible lights

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单项选择题

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

单项选择题

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

单项选择题

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