单项选择题
A.at the compressor discharge B.at the compressor suction C.in the expansion valve D.in the receiver
Which of the listed pressure control valves would be us...
单项选择题Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）
A.Pressure-reducing valve B.Unloading valve C.Counterbalance valve D.Pressure-relief valve
If a centrifugal bilge pump were continually operated w...
单项选择题If a centrifugal bilge pump were continually operated with the discharge valve closed the （）.
A.motor overload would open B.relief valve would open C.pump would eventually overheat D.motor would overheat
In order to accurately measure very low pressures, whic...
单项选择题In order to accurately measure very low pressures, which of the instruments listed should be used?（）
A.Compound gage B.Bonrdon tube C.Manometer D.Deadweight gage
