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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
单项选择题
A.back
B.side
C.gap
D.bottom
