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“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 wheel
B:a modem diesel engine；exhaust gases
C:a compressor；an exhaust gas turbocharger
D:a compressor；a turbine wheel

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出自：海船船员证

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