In the given options, the non-commercial source of energy is
A. coal
B. lignite
C. firewood
D. refined petroleum products
Answer: Option D
A. coal
B. lignite
C. firewood
D. refined petroleum products
Answer: Option D
A. aluminium
B. iron
C. stainless steel
D. copper
A. Rutt
B. Stella Saundaraja
C. Crang and Rush
D. Mary Jean Alexander
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