单选题Gas exchange, which is a basic part of the cycle of an internal combustion engine, is（）Athe supply of normal air and removal of compressed airBthe supply of fuel oil and combustion of the atomized oilCthe supply of fresh air and removal of exhaust gasesDthe supply of fresh air and removal of the extra heat
单选题
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
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