单项选择题
When entering from seaward，a buoy displaying a single-flashing red light would indicate （）.
A.a junction with the preferred channel to the left B.a sharp turn in the channel to the right C.the starboard side of the channel D.a wreck to be left on the vessel's port side
单项选择题 When entering a channel from seaward，the numbers on buoys（）.
单项选择题 When approaching a preferred-channel buoy，the best channel is NOT indicated by the（）.
单项选择题 When a buoy marks a channel bifurcation，the preferred channel is NOT indicated by（）.
