单项选择题
A.Immediately after floating free
B.After about one hour when the salt water activates the battery
C.Only when keyed by the radar of another vessel
D.Only when daylight activates the photovoltaic cell
单项选择题 When should the emergency position-indicating radio beacon be activated after abandoning an OSV?（）
单项选择题 When hanging off drill pipe in emergency situations aboard a ship，the preferred location of the drill bit is（）.
单项选择题 When amendments are made to the Shipboard Oil Pollution Emergency Plan，the revisions must be submitted to the Coast Guard（）.