单项选择题
A.They have the same function as frapping line
B.They are safety lines for personnel inside the lifeboat
C.They slow the descent of the lifeboat
D.They hold the lifeboat alongside the embarkation deck
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?（）
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?（）