单项选择题
Entering from seaward，triangular-shaped daymarks are used to mark（）.
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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单项选择题
During the day，a vessel with a tow over 200 meters in length will show（）.
A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward -
单项选择题
Daymarks marking the starboard side of the channel when going towards the sea are（）.
A.green squares
B.green triangles
C.red squares
D.red triangles -
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
