单选题For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.Athe cylinder coverBthe bottom of bed-plateCthe sumpDthe crankcase door
单选题
For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.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
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