單項選擇題One method of controlling rats on vessels is by rat-proofing. Rat-proofing is accomplished by （）.

A.installing rat guards on the mooring lines when in port
B.keeping foods protected and avoiding the accumulation of garbage
C.eliminating possible living spaces for rats when the ship is constructed
D.trapping and/or poisoning the rats


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2.單項選擇題In order to benefit from the use of storm oil in heavy seas，the storm oil should be spread （）.

A.around the rudder and screws
B.completely around the vessel
C.to leeward of the vessel
D.to windward of the vessel

4.單項選擇題If a vessel is engaged in fishing according to the definitions in the Rules，it will have （）.

A.gear extending from the side or stern
B.gear that restricts maneuverability
C.less than 50 percent trolling lines
D.None of the above

5.單項選擇題How are riveted lap joints made watertight?（）

A.The faying surfaces are coated with white lead (or similar product) before the rivets are set
B.A sealing weld bead of 1/8 or less pitch is run along the plate edge
C.The plate edge is split close to an adjacent plate and mechanically forced into contact with the adjacent plate
D.A properly riveted joint will be watertight; any leakage is stopped by setting up on the rivets