carbonaceous rock造句怎么写

4、The city of Guiyang is located in a wide karst valley basin in the central part of Guizhou Plateau, where carbonaceous rocks are developing and karst groundwater sources are abundant.

2、In Yutangba, native se extensively exists within Se-rich carbonaceous rocks, abandoned stone coal spoils and high-Se soils close to Se-rich carbonaceous strata.

1、The occurrence of gold rich carbonaceous rock series and the extensive development of altered rock bodies in the region made the mobilization and concentration of gold possible.

3、The Se-rich carbonaceous rocks in the north of Yutangba is prevalently being recognized as the main source of selenium of Yutangba.