... dimensional precision 尺寸精度 dimensional proportion 尺寸比例 dimensional range 尺寸范围 ...
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Hypereutectic Al-Si alloy which has small proportion, low coefficient of thermal expansion, good wear resistance and dimensional stability is an ideal piston material.
过共晶铝硅合金比重小、热膨胀系数低、耐磨性和体积稳定性好，是理想的活塞材料。
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