* the rubber react with sulfur in moderation at temperature higher than the melting point of กำมะ sulfur
coating used to prevent the surface of the metal contact with water and oxygen gas
.- found in cellulose, which is in the parts of plants such as cotton
- is the rock caused by the sedimentation of the pellet ore from the weathering of any kind of the earth surface
* A synthetic fiber up instead of natural fiber
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