The dry ash free volatile content of a coal is 47%, which is most likely to belong to ().
A: Lignite
B: Lean coal
C: Anthracite
D: Bituminous coal
A: Lignite
B: Lean coal
C: Anthracite
D: Bituminous coal
A
举一反三
- The dry ash free volatile content of a coal is 7%, which is most likely to belong to (). A: Bituminous coal B: Anthracite C: Lignite D: Lean coal
- The most easily oxidized coal is (). A: lignite coal B: bituminous coal C: lean coal D: anthracite coal
- ( ) is not a real coal, but only a precursor. A: Anthracite B: Bituminous coal C: Lignite D: Peat
- True or False: Of the fossil fuels (coal, oil, and gas), coal deposits will most likely have to be stranded in the highest proportion. A: True B: False
- Which of the following is not a common way for coal caving? ( ) A: Top caving coal in group sequence B: Top caving coal in single cycle sequence C: Top caving coal in multiple cycles in sequence D: Top caving coal in intervals of single cycle
内容
- 0
Rich in coal, abundant in oil and gas, while coal is the most important basic energy and raw material in China.
- 1
Coal is most used for the electricity production in()and().
- 2
The volatile content of () is used as the classification basis for power coal. A: as received basis B: air drying basis C: dry basis D: dry and ash free basis
- 3
Fly ash can partly take the place of （）. A: paving material B: cement C: concrete D: the coal by-product
- 4
The coal industry is running down as coal is gradually replaced by oil.( industry )