单项选择题
A.They are used to steady a lifeboat when lowered B.They are normally attached to the davit span C.They are needed only on radial davits D.They are used to clear the puddings
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
A.Two B.Three C.Four D.Five