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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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单选题The pistons are cooled by （） oil from the forced lubrication.A
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givingC
supplyingD
being supplied
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by vary the fuel valve spring forceC
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the flangeC
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