A piston is at bottom dead center when it is（）<br>A:opening the exhaust ports<br>B:closing the fuel ports<br>C:farthest from the cylinder head<br>D:nearest to the cylinder head

A piston is at bottom dead center when it is（）
A:opening the exhaust ports
B:closing the fuel ports
C:farthest from the cylinder head
D:nearest to the cylinder head

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