The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.<br>A:the cylinder head<br>B:the cross-head<br>C:the moving piston<br>D:the stationary piston

The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.
A:the cylinder head
B:the cross-head
C:the moving piston
D:the stationary piston

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