單項選擇題Many sheath-screw davits have markings to indicate the maximum angle to which they should be cranked out. If the angle is exceeded，the davit（）.

A.may jam against the stops
B.will not automatically position the boat at the embarkation station
C.screw may come out of the sheath
D.will chafe against the falls and may cause their failure


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1.單項選擇題Maintaining the close tolerances in diesel fuel pumps and injectors requires the use of（）.

A.fuel/water separators
B.day tanks
C.injector test stand
D.fuel filters

2.單項選擇題Lubricating oil should be changed on a heavy duty diesel engine when（）.

A.it gets dark in color
B.a sample rubbed between fingers feels thin
C.it has been in use for a specified interval
D.it no longer supports combustion

3.單項選擇題If your propeller is racing in rough weather，you should（）.

A.decrease your engine speed
B.ignore it
C.increase your engine speed
D.stop your engine until the rough weather passes

4.單項選擇題If you are unable to stop a diesel engine by any other means，you should（）.

A.discharge a CO2 extinguisher in the air inlet
B.pull off the distributor cap
C.secure the jacket water
D.secure the starting air supply valve

5.單項選擇題If ignited，which material would be a class B fire?（）

A.Magnesium
B.Paper
C.Wood
D.Diesel Oil