单项选择题
On open lifeboats，the purpose of the wire stretched between the davit heads is to（）.
A.keep the movement of the davits at the same speed B.keep the davits from slipping when they are in the stowed position C.prevent vibration during lowering of the boat D.support the manropes
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（）.
单项选择题 Most covered lifeboats will right themselves after capsizing if the（）.
