For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.<br>A:cylinder casing<br>B:cylinder bore<br>C:crankcase door<br>D:aperture in the cylinder block

For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.
A:cylinder casing
B:cylinder bore
C:crankcase door
D:aperture in the cylinder block

出自：海船船员证

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