单项选择题

Diesel engine cylinder head test cocks are used to （）

A.check cylinder lubrication
B.connect the pressure indicator pressure
C.test cylinder heads
D.connect the exhaust gas pyrometers

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单项选择题

Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）

A.At zero load the intake manifold pressure is greater than the exhaust manifold pressure
B.At full load the intake manifold pressure and exhaust manifold pressure are equal
C.At full load the intake manifold pressure is less than the exhaust manifold pressure
D.At full load the intake manifold pressure is greater than the exhaust manifold pressure

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Lubricating oil viscosity in an operating diesel engine can be reduced by（）

A.increasing cooling water flow
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A.engine power losses
B.smoking due to unburned fuel
C.high exhaust temperature readings
D.all of the above