單項(xiàng)選擇題

A.diameters of journals
B.deflections of crankwebs
C.diameters of crankpins
D.none of the above

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A.the cylinder cover is cracked
B.the injector holes is clogged
C.the cams are not properly set
D.fuel pump is leaking

A.too low lead
B.water in fuel
C.too tight spring
D.leakage