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non-metallic impurity的用法

non-metallic impurity的意思|示意

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non-metallic impervious sheath
non-metallic heating element
non-metallic heat exchanger
non-metallic hard material
non-metallic gear
non-metallic inclusion
non-metallic ingredient
non-metallic inorganic coating
non-metallic inpurity
non-metallic ion

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