问题描述：
[单选]
The cylinder liners are made of（）and the cylinder surfaces are sometimes chromium-plated．
A．steel
B．copper
C．cast iron
D．stainless steel
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答案解析：无
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上一篇：The cylinders， with cooling jackets， are（）to the engine frame by eight tie rods．
下一篇：The cylinder is fitted with internal liner so that a water space is left（）the liner and the outer wall．
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