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| 二丝式保护渣层厚度测定法 (【技】该测定法的原理如下：将钢丝和铜丝固定在钢板上，插人渣层中。由于钢丝熔点低于钢水温度，故钢丝熔化后的长度为整个渣层厚度；铜丝熔点低于液渣层温度，故钢丝熔化后长度和铜丝熔化后长度之差为液渣层厚度。) | |||
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