单项选择题
A ship must report a collision with an aid to navigation maintained by the Coast Guard to which office?（）
A.Nearest Oceanographic office B.The Marine Safety Center at Coast Guard Headquarters C.National Ocean Service D.Nearest Officer in Charge，Marine Inspection
单项选择题 A load line for a ship is assigned by the（）.
单项选择题 A chain stripper is used to（）.
