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低热膨胀铸铁
met.
low thermal expansion cast iron
(【技】几何形状和尺寸随温度变化很小的一种合金铸铁。通过加人某些合金元素调整热膨胀系数,常用于制造精密设备或与某些低膨胀合金相匹配。)
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