單項(xiàng)選擇題When the air charge contacts with the cylinders and pistons and mixes with the residual gases, it will()

A.increase in temperature
B.lose its energy partly
C.expand and do work
D.begin to be compressed


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2.單項(xiàng)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