单选题What is TRUE concerning frapping lines?（）AThey are used to steady a lifeboat when loweredBThey are normally attached to the davit spanCThey are needed only on radial davitsDThey are used to clear the puddings
单选题
What is TRUE concerning frapping lines?（）
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
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