单项选择题
A.increase the fuel oil temperature B.decrease the fuel oil temperature C.decrease the fuel oil supply pressure D.increase the air supply
Close the （）.A.keywayB.shaftC.packingD.valve
单项选择题Close the （）.
A.keyway B.shaft C.packing D.valve
Which pump is the self-priming pump?（）A.turbineB.centri...
单项选择题Which pump is the self-priming pump?（）
A.turbine B.centrifugal C.ejector D.mixed flow
The younger motorman as well as the others （） to operat...
单项选择题The younger motorman as well as the others （） to operate the oil separator.
A.has learnt B.have learnt C.learn D.are learning
