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（）.

单项选择题 The opening in the deck beneath the anchor windlass that leads to the chain locker is the（）.