单项选择题
Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?（）
A.The viscosity off the fuel
B.The quantity of water to be removed from the fuel
C.The specific gravity of the fuel
D.The quantity of dirt to be removed from the fuel
单项选择题 If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the（）
单项选择题 A centrifugal fuel oil purifier should be shut down if （）
单项选择题 If fuel oil were being discharged from the waster outlet of a fuel oil disk type centrifuge, operated as separator, you should（）