單項選擇題A crack in the deck plating of a vessel may be temporarily prevented from increasing in length by().

A.cutting a square notch at each end of the crack
B.drilling a hole at each end of crack
C.slot-welding the crack
D.welding a doubler over the crack


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2.單項選擇題A deadhead is a (n)().

A.tree or long awash in a nearly vertical position
B.crew member who refuses to work
C.upstream end of a load wall
D.buoy that is adrift

3.單項選擇題A disk with a horizontal line through its center, equivalent to the summer load line, is called the().

A.deadrise mark
B.maximum alloable draft mark
C.pilmsoll mark
D.tonnage mark

4.單項選擇題A fire starting by spontaneous combustion can be expected in which condition?().

A.Paints, varnish, or other liquid flammables are stowed in a dry stores locker
B.Inert cargoes such as pig iron are loaded in a wet condition
C.Oily rags are stowed in a metal pail
D.Clean mattresses are stored in contact with an electric light bulb

5.單項選擇題A floating vessel will behave as if all of its weight is zcting downward through the().

A.center of gravity
B.center of buoyancy
C.center of flotation
D.metacenter