单项选择题

In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with（）

A.low firing pressure
B.low exhaust temperature
C.mechanical knock in each cylinder
D.fuel knock in each cylinder

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单项选择题

A.dry liner
B.wet liner
C.jacket liner
D.corrugated liner

单项选择题

A.Steel brush
B.Fine emery cloth or steel wool
C.A section of the removed compression ring
D.A case hardened scraper

单项选择题

A.Return-flow
B.Uniflow
C.Cross-flow
D.Direct flow