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單項選擇題

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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單項選擇題

The cylinder liner forming the cylinder wall and the inside of the water jacket is called a（）

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

單項選擇題

Which of the listed devices could be used as a substitute for a ring grooving tool?（）

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

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