In a four stroke engine, which process lasts the longest period?（）<br>A:exhaust and suction process<br>B:suction and compression process<br>C:combustion and exhaust process<br>D:working and exhaust process

In a four stroke engine, which process lasts the longest period?（）
A:exhaust and suction process
B:suction and compression process
C:combustion and exhaust process
D:working and exhaust process

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