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
Low compressor head pressure in a refrigeration system can be caused by（）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The general purpose of a heat exchanger is to （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）