最終更新日:2024/08/03
Caking coal is a type of coal that can form a solid, cohesive mass when heated.
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Caking coal is a type of coal that can form a solid, cohesive mass when heated.
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Caking coal is a type of coal that can form a solid, cohesive mass when heated.
Caking coal is a type of coal that can form a solid, cohesive mass when heated.