单选题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 （）AcrankcaseBcylinder headCvalve coverDengine frame
单选题
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
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