In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.<br>A:aluminum-plated<br>B:bronze-plated<br>C:zinc-plated<br>D:chromium-plated

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

出自：海船船员证

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