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單項(xiàng)選擇題

In an auxiliary diesel engine, the reason for knurling the piston skirt is to（）

A.improve skirt lubrication
B.allow for expansion
C.transmit forces evenly
D.improve the piston seal

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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

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

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