单项选择题
A.the same ratio B.more chain for each fathom of depth C.less chain for each fathom of depth D.two anchors with the same ratio of chain
A.Four times the depth of water B.Two and one-half times the depth of water C.Five to seven times the depth of water D.Fifteen times the depth of water
A.prevent fouling of the anchor B.decrease swing of the vessel C.prevent dragging of the anchor D.reduce strain on the windlass