A.examine the condition of the propeller
B.chip and paint all hull protection zincs
C.install new docking plugs in all cofferdams
D.inspect the hull for hogging or sagging
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A.the suction and discharge valves
B.tools and equipment served by compressed air
C.air line reducing valves
D.all of the above
A.Moisture separator
B.Vacuum breaker
C.Lubricator
D.Non-return valve
A.rate of doing work
B.amount of force needed to overcome friction
C.amount of work accomplished
D.distance through which an object is moved
A.re-adjust the discharge pressure
B.clean the expansion valve screen
C.add refrigerant
D.adjust the expansion valve
A.splash method
B.mechanical force feed lubricators
C.detached sump method
D.internal cooling passages in the crankshafts and connecting rods
最新試題
A salinity indicator is used to determine the （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
Which of the following statements is correct concerning heat transfer?（）
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
A pressure drop through the refrigerant liquid line may cause （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）