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单选题
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
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Faulty thermostatic bypass valveB
Eroded zinc pencils in the heat exchangerC
Steam formation in the expansion tankD
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Excessive piston blow-by to the manifoldB
Insufficient cooling water flowC
Accumulated water in the air boxesD
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Excessive wearB
Scuffing of the linerC
Piston seizureD
All of the above
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faulty combustionB
excessive ring temperatureC
over lubricationD
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