单项选择题
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
To correct the condition of slugging and flooding back ...
单项选择题To correct the condition of slugging and flooding back in a refrigeration system, it may be necessary to （）.
A.re-adjust the discharge pressure B.clean the expansion valve screen C.add refrigerant D.adjust the expansion valve
On small, low pressure, air compressors, the cylinders ...
单项选择题On small, low pressure, air compressors, the cylinders are usually lubricated by the （）.
A.splash method B.mechanical force feed lubricators C.detached sump method D.internal cooling passages in the crankshafts and connecting rods
While troubleshooting a refrigeration system for low he...
单项选择题While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to （）.
A.change the expansion valve adjustment B.readjust the water regulating valve to increase the flow of water C.purge air from the condenser D.clean the waterside of the condenser
