單項選擇題A（）is the intersection of the surface of a sphere and a plane passing through the center of the sphere.

A.great circle
B.small circle
C.large circle
D.general circle


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1.單項選擇題A “Mediterranean moor” should be used when（）.

A.anchoring in the Mediterranean
B.docking stern to a berth
C.docking bow to a berth
D.anchoring in a strong current

2.單項選擇題（）is not a step for anchoring preparation.

A.To take off the covers from the hawse pipes and clear the spurling pipes
B.To make sure that the windlass is out of gear and the brakes are on
C.To turn the windlass over slowly
D.To inform the engine room to ensure that deck power and water are off

3.單項選擇題When anchoring，good practice requires 5 to 7 fathoms of chain for each fathom of depth. In deep water you should use（）.

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

4.單項選擇題When anchoring a vessel under normal conditions，which scope of chain is recommended? （）

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

5.單項選擇題When anchored，increasing the scope of the anchor chain normally serves to（）.

A.prevent fouling of the anchor
B.decrease swing of the vessel
C.prevent dragging of the anchor
D.reduce strain on the windlass