有关MnO2、O2、NO2、CO2四种物质的下列说法中正确的是 A.都含有2个氧

有关MnO2O2NO2CO2四种物质的下列说法中正确的是

A.都含有2个氧原子                  B.都含有氧元素

C.都含有氧分子                      D.都是氧化物

答案

B

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