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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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