單項選擇題Which statement is TRUE concerning fuel vapors on a vessel（）.

A.Fuel vapors gather in the lowest portions of the vessel
B.Fuel vapors can only be ignited by an open flame
C.Vent outlets should be located above the level of the carburetor air intake
D.None of the above


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1.單項選擇題Which is a part of a vessel’s standing rigging（）.

A.Sheet
B.Backstay
C.Topping lift
D.Downhaul

2.單項選擇題What term describes a three-strand rope laid up right- or left-handed（）.

A.Soft-laid
B.Hard-laid
C.Sennet-laid
D.Hawser-laid

3.單項選擇題What is NOT a function of the steam drum of a marine water-tube boiler（）.

A.Receives saturated steam from the generating tubes
B.Serves as a reservoir of boiler feed water
C.Holds internal fittings for separation of moisture from steam
D.Collects steam exhausted from the turbines

4.單項選擇題To find the cause of a gasoline engine’s failure to start，you should（）.

A.Break the joint in the fuel line at the engine and let the gas run in the bilges
B.Disconnect the wires at the spark plugs and make the spark jump the gap
C.Prime the engine with ether through spark plug openings
D.Ventilate the space，then check the battery，spark plugs，carburetor，and fuel line

5.單項選擇題The three conditions which cause engine shutdown are overspeed，low lube oil pressure，and（）.

A.High lube oil pressure
B.High jacket water pressure
C.High jacket water temperature
D.Low jacket water pressure