单项选择题
The helicopter deck of a ship must be marked with the units identification，appropriate aiming circles，and a continuous line on the perimeter which is（）.
A.8 inches wide B.16 inches wide C.24 inches wide D.32 inches wide
单项选择题 The equipment required to remove an on-deck oil spill on a barge transfering oil must either be arried on board or（）.
单项选择题 The davit launched life raft can be boarded（）.
单项选择题 The davit aboard a ship is used to（）.
