单选题In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.Aaluminum-platedBbronze-platedCzinc-platedDchromium-plated
单选题
In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.
A
aluminum-plated
B
bronze-plated
C
zinc-plated
D
chromium-plated
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