A:2H2+O2 →点燃 2H2O
B:H2+Cl2 →点燃 2HCl
C:2CO+O2 →点燃 2CO2
D:CH4+2O2 →点燃 2H2O+CO2
mn>0是x2m+y2n=1表示椭圆的( )条件.
Thank you for __________ me. I can't finish the work so early _________ your help.
已知在酸性溶液中,下列物质氧化H2S生成S是时,自身发生如下变化:IO3﹣→I2; Fe3+→Fe2+; SO2→S;MnO4﹣→Mn2+.如果分别用等物质的量的这些物质氧化足量的H2S,得到S最多的是( )