单项选择题
Prior to lowering the lifeboat，the most important item to check is the（）.
A.oars B.sail C.boat plug D.life preservers
单项选择题 On open lifeboats，the purpose of the wire stretched between the davit heads is to（）.
单项选择题 On a passenger vessel，the vessel’s name must appear on（）.
单项选择题 Most lifeboats are equipped with（）.
