单项选择题
According to the regulations for life boat falls，which action must be taken at 30-month intervals?（）
A.End-for-ended B.Renewed C.Inspected D.Weight tested
单项选择题 A sheave is a（）.
单项选择题 A sea anchor is（）.
单项选择题 A person referring to the stern sheets of a lifeboat is speaking of（）.
