单项选择题
A.To support the overhang of the stern
B.To strengthen the plating against the pounding of the sea
C.To add strength to the deck beams which support the weather deck
D.To support the plating of a cylindrical tank
单项选择题 The platform that supports the derrickman when tripping pipe is called the（）.
单项选择题 The perforated，elevated bottom of the chain locker，which prevents the chains from touching the main locker bottom and allows seepage water to flow to the drains，is called a（）.
单项选择题 The opening in the deck that leads the anchor cable outside the hull is the（）.