One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the （）<br>A:crankcase<br>B:cylinder head<br>C:valve cover<br>D:engine frame

One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the （）
A:crankcase
B:cylinder head
C:valve cover
D:engine frame

出自：海船船员证

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