单项选择题 When the air charge contacts with the cylinders and pistons and mixes with the residual gases, it will（）

单项选择题 “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（）

单项选择题 Gas exchange, which is a basic part of the cycle of an internal combustion engine, is（）