A.0.40t/m3~0.45t/m3 B.0.45t/m3~0.50t/m3 C.0.55t/m3~0.60t/m3 D.0.60t/m3~0.65t/m3
A.2C+O2=2CO B.C+O2=CO2 C.2C+CO2=2CO