Fuels and Combustion
Insitu theory and drift theory are related to the

Origin of coal
Origin of petroleum oil
Coalification
Variation of coal quality with depth

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Fuels and Combustion
Calorific value of

Light paraffinic fuel oils is lower than that of equivalent olefins
Light paraffinic fuel oils is higher than that of equivalent olefins
Light paraffinic fuel oils is equal to that of equivalent olefins
N-paraffin is lower than that of iso-paraffins of the same compounds

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