单项选择题

The best tool to use for removing the carbon ridge at the top of an enginecylinder, prior to removing the piston, is to use（）

A.an electric grinder
B.a metal scraper
C.a reamer
D.a three-wing hone

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单项选择题
Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?（）

A.Faulty turbocharger turbine diffuser ring
B.Faulty turbocharger compressor ring
C.Insufficient cooling water flow
D.Clogged air intake filters
单项选择题
Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）

A.Excessive piston blow-by to the manifold
B.Insufficient cooling water flow
C.Accumulated water in the air boxes
D.Clogged air intake filters
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