单选题At which of the following locations would a duplex pressure gage most likely be located?（）AFuel oil service pump dischargeBFuel oil strainerCFuel oil heaterDFuel oil flow meter
单选题
At which of the following locations would a duplex pressure gage most likely be located?（）
A
Fuel oil service pump discharge
B
Fuel oil strainer
C
Fuel oil heater
D
Fuel oil flow meter
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