用高锰酸钾加热制取氧气，反应时加进了二氧化锰，二氧化锰在该反应中是请选择DCBA4X/Z-`6x7j1s*d0E+t6o0h*\)y6B6v2d3V,b4E
A．催化剂+t6o0h*\)y6B6v2d3V,b4E
B．氧化剂+t6o0h*\)y6B6v2d3V,b4E
C．生成物+t6o0h*\)y6B6v2d3V,b4E
D．反应物+t6o0h*\)y6B6v2d3V,b4E