题目内容

In a two-stroke engine, the piston consists of a lower part, which is named as and usually

A. low-half, cast iron; top-half, heat-resistant steel
B. low-half, aluminum; top-half, stainless steel
C. piston skirt; cast iron; piston crown; heat-resistant steel
D. piston skirt; aluminum; piston crown; stainless steel

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