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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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单选题The piston ring grooves for a standard engine are （）A
chromium-plate against wearB
anti-corrosion treatedC
white metal lined against wearD
flame hardened against wear
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