单选题Low compression pressure in a diesel engine may be the result of （）Ainsufficient fuel supply due to fuel pump valves sticking or leakingBexcessive mechanical clearance between the piston crown and cylinder headCexcessively worn fuel pump plungerDexcessive exhaust back pressure
单选题
Low compression pressure in a diesel engine may be the result of （）
A
insufficient fuel supply due to fuel pump valves sticking or leaking
B
excessive mechanical clearance between the piston crown and cylinder head
C
excessively worn fuel pump plunger
D
excessive exhaust back pressure
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