单项选择题
At 1810，a red buoy bears 010° relative. This buoy marks（）.
A.the side of York Spit Channel B.the visibility limit of the red sector of Cape Henry Light C.a submerged obstruction in York Spit Channel D.the York River Entrance Channel
单项选择题 At 0845，you are approaching the entrances to Thimble Shoal Channel. What channel must you use?（）
单项选择题 At 0815，visibility is excellent and you can see Montauk Point. Montauk Point Light is（）.
单项选择题 At 0815，visibility is excellent and you can see Montauk Point. Montauk Point is（）.
