单项选择题
A.any deck below the main deck and above the lowest deck B.a member that gives fore-and-aft strength C.made by placing two bulkheads a few feet apart D.a heavy fore-and-aft beam under the deck
A.trim by the stern B.trim by the head C.be on an even keel D.be tender
A.Corner fittings B.Framework，primarily the corner posts C.Framework and siding acting as a girder D.Aluminum side and end panels