SILICEOUS FOSSIL MEALS (FOR EXAMPLE, KIESELGUHR, TRIPOLITE AND DIATOMITE) AND SIMILAR SILICEOUS EARTHS, WHETHER OR NOT CALCINED, OF AN APPARENT SPECIFIC GRAVITY OF 1 OR LESS.

 
  • 硅質(zhì)化石粗粉(例如各種硅藻土)及類(lèi)似的硅質(zhì)土,不論是否煅燒,其表觀(guān)比重不超過(guò)1
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