单选题The piston ring grooves for a standard engine are ()Achromium-plate against wearBanti-corrosion treatedCwhite metal lined against wearDflame hardened against wear

单选题
The piston ring grooves for a standard engine are ()
A

chromium-plate against wear

B

anti-corrosion treated

C

white metal lined against wear

D

flame hardened against wear


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