Test A: porcelain Crucible ? A porcelain crucible was heated to a dull red color, placed on the test material, and allowed to cool to ambient temperature.
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- 测试A:陶瓷坩埚。将置于所测试材料表面的陶瓷坩埚,加热至暗红色然后让其冷却,温度降至室温。