A.the starboard side of the channel
B.the centerline of the channel
C.an obstruction where the preferred channel is to starboard
D.special purpose areas
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A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward
A.green squares
B.green triangles
C.red squares
D.red triangles
A.a floodlight
B.two red lights in a vertical line
C.a single red light
D.any visible lights
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
A.masthead light
B.all-round light
C.sidelight
D.sternlight
最新試題
During the day，a vessel with a tow over 200 meters in length will show（）.
An occulting light is one in which（）.
A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）
As defined in the Rules，a towing light is a yellow light having the same characteristics as a(n)（）.
If your vessel were proceeding down river (descending)，a green square marker with a green reflector border on the right bank would be a（）.
The duration of a prolonged blast of the whistle is（）.
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（）.
Lighted information markers show（）.
According to the Rules，when should lights be displayed?（）.
A towing light，according to the Rules，is a（）.