A piston is said to be at top dead center when it is （）<br>A:opening the exhaust ports<br>B:placed on top of the engine along its centerline<br>C:farthest from the cylinder head<br>D:nearest to the cylinder head

A piston is said to be at top dead center when it is （）
A:opening the exhaust ports
B:placed on top of the engine along its centerline
C:farthest from the cylinder head
D:nearest to the cylinder head

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