单项选择题X 纠错
A.improve skirt lubrication
B.allow for expansion
C.transmit forces evenly
D.improve the piston seal
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单项选择题
A.Hard alloy steel construction
B.Beveled edges on the valve head
C.Low alloy steel construction
D.Poppet type design
单项选择题
A.a leaking seal ring
B.heat transfer from exhaust valves
C.restricted cooling passages
D.overheated intake valves
单项选择题
A.top of the ring groove
B.back of the ring groove
C.bottom of the ring groove
D.piston ring end clearance
单项选择题
A.oil rings only
B.compression and scraper rings
C.cylinder liner sealings
D.cylinder liner ring grooves
单项选择题
A.wrist pin bushings
B.compression rings
C.cylinder liner seals
D.cylinder liner sealing ring
单项选择题
A.Gasoline
B.Water
C.Lubricating oil
D.sulphur compounds
单项选择题
A.back clearance
B.side clearance
C.gap clearance
D.taper clearance
单项选择题
A.reduce fuel weight
B.increase specific gravity
C.separate fuel from lube oil
D.reduce fuel viscosity
单项选择题
A.valve guides
B.oil control rings
C.valve seats
D.compression rings
单项选择题
A.throughput
B.additive percent
C.cetane number
D.TBN number
