For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.<br>A:the cylinder cover<br>B:the bottom of bed-plate<br>C:the sump<br>D:the crankcase door

For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.
A:the cylinder cover
B:the bottom of bed-plate
C:the sump
D:the crankcase door

出自：海船船员证

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