单项选择题
A.lube oil pumping B.rotating rings C.gas pressure behind the ring D.passage of hot gases
When inspecting piston rings through the ports of a two...
单项选择题When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）
A.insufficient lubrication B.improper piston cooling C.blow-by D.overload operation
Visual inspection of chrome-plated piston compression r...
单项选择题Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which（）
A.has a crown-face B.exceeds wear limits through normal wear C.has excessive blow-by D.is in good condition
A bright shiny appearance of the sealing surfaces on di...
单项选择题A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）
A.combustion gas blow-by B.excessive lubrication C.properly functioning rings D.insufficient cylinder cooling
