单项选择题
A.a boat bucket
B.an air tank filled with water
C.an oar and canvas weighted down
D.All of the above
单项选择题 AN APPOINTMENT BETWEEN VESSELS NORMALLY MADE ON RADIO TO MEET IN A CERTAIN AREA OR POSITION defines（）.
单项选择题 All casualties such as personnel injuries or illness，oil spills，accidental fire，collision，stranding，and unusually severe weather damage，whether at sea，in port，or in shipyard，must be promptly（）to the company.
单项选择题 After you activate your emergency position indicating radiobeacon，you should（）.