单项选择题
What is the minimum number of deck officers，able seaman or certificated persons required for a lifeboat on a vessel in ocean service?（）
A.Two B.Three C.Four D.Five
单项选择题 What is the accepted standard for wire rope falls used in connection with the lifeboat gear?（）
单项选择题 What is required by regulations concerning the stowage of lifeboats on cargo vessels?（）
单项选择题 What could be a result of insufficient lubrication of lifeboat winches and davits?（）
