Which statement is true?
(1)Town gas is produced from coal.
(2)Town gas contains hydrogen as the major component.
(3)Oxygen is added to enhance the flammability of town gas prior to its delievery to consumers.
Answer係2同3.
我知2點解, 但係3就唔明
TOWN GAS本身就唔係好Flammable,因為有H2, 但點解仲要加O2?
thanks~^^