單項選擇題“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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1.單項選擇題Gas exchange, which is a basic part of the cycle of an internal combustion engine, is()

A.the supply of normal air and removal of compressed air
B.the supply of fuel oil and combustion of the atomized oil
C.the supply of fresh air and removal of exhaust gases
D.the supply of fresh air and removal of the extra heat

5.單項選擇題In some diesel engine designs,()the injection of cylinder oil is timed to impinge when the piston and only impinge on()

A.is coming upward;cylinder ring belt
B.is going downward;piston ring belt
C.is coming upward;piston ring belt
D.is going downward;cylinder ring belt