Pick out the wrong statement ?

Fuels and Combustion 12/10/2021

A. Carburetted water gas is also called blue gas
B. Coals are divided in four species according to their carbon content in Seylor’s classification
C. Carbonisation time in a by-product coke oven is about 16 hours
D. Gross and net calorific value of a fuel is the same, if it does not contain hydrogen or
hydrocarbons

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