The main composition of bio gas is
A. methane
B. carbon dioxide
C. nitrogen
D. hydrogen
Answer: Option A
A. methane
B. carbon dioxide
C. nitrogen
D. hydrogen
Answer: Option A
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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