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单选题
When monitoring diesel engine performance, the most useful instrument to use is the （）
A
dwell-tachometer
B
exhaust gas pyrometer
C
fuel flow rate mete
D
exhaust gas analyzer
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the piston is just coming upward from the bottom dead centerB
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air turbulenceB
fuel penetrationC
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Electric startingC
IgnitionD
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DTCC
BDCD
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Lube oil pressure gaugeB
Jacket water temperature gaugeC
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单选题When monitoring diesel engine performance, the most useful instrument to use is the （）A
dwell-tachometerB
exhaust gas pyrometerC
fuel flow rate meteD
exhaust gas analyzer
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单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）A
a modern diesel engine；a turbine wheelB
a modem diesel engine；exhaust gasesC
a compressor；an exhaust gas turbochargerD
a compressor；a turbine wheel
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