单项选择题
A.improve skirt lubrication B.allow for expansion C.transmit forces evenly D.improve the piston seal
Which of the listed design features is found in an exha...
单项选择题Which of the listed design features is found in an exhaust valve and NOT in an intake valve?（）
A.Hard alloy steel construction B.Beveled edges on the valve head C.Low alloy steel construction D.Poppet type design
A diesel engine cylinder head can crack as a result of ...
单项选择题A diesel engine cylinder head can crack as a result of （）
A.a leaking seal ring B.heat transfer from exhaust valves C.restricted cooling passages D.overheated intake valves
In large, low-speed, main propulsion diesel engine, pos...
单项选择题In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）
A.top of the ring groove B.back of the ring groove C.bottom of the ring groove D.piston ring end clearance
