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单选题
Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.
A
the cylinder cover
B
the piston rings
C
the piston crown
D
the piston skirt
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the air receiversB
the starting valvesC
the cylinder coversD
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supplyingD
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单选题The cylinder covers and the liners are bolted together by means of （）.A
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PistonB
SoundingC
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Connecting
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