At which of the following locations would a duplex pressure gage most likely be located?（）

A.maintain even distribution of bearing wear
B.maintain a constant oil temperature
C.maintain a pressurized film between moving surfaces
D.remove entrained water

A.so as to never be integral lube
B.with a sloped bottom
C.only of nonferrous, noncorrosive metals
D.with drain/return lines terminating just above or at the designed normal level

A.is an indication of the amount of noncombustible material present in the oil
B.indicates the quantity of energy released by burning a unit amount of the fuel
C.is useful for determining proper atomization temperatures
D.reflects the overall thermal efficiency of the fuel oil service system