单项选择题
When hanging off drill pipe in emergency situations aboard a ship，the preferred location of the drill bit is（）.
A.on bottom with the full drill string in tension B.one stand (approximately 93 feet) off bottom C.no deeper than the shoe of the last casing set D.as close to the surface as possible
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（）.
单项选择题 When a survival craft drill is held，the person in charge must insure that（）.
单项选择题 What would NOT be a distress signal?（）
