单项选择题
A.overhaul B.running C.blowing down D.All of the above are correct
Due to （） action of pistons some relative motion betwee...
单项选择题Due to （） action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.
A.reciprocating B.rotating C.running D.removing
Doors are generally formed in the （） of the both in-lin...
单项选择题Doors are generally formed in the （） of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.
A.bedplates B.columns C.cylinder blocks D.safety caps
Dirty oil must be （） before being used again.A.mixed wi...
单项选择题Dirty oil must be （） before being used again.
A.mixed with clean oil B.purified C.heated D.strained
