具有可燃性和还原性的气体单质是请选择ABCD4K8q+?2b7m/G(I:o1m)J(k+c6Q2A6T0o1}
A．CO/G(I:o1m)J(k+c6Q2A6T0o1}
B．C/G(I:o1m)J(k+c6Q2A6T0o1}
C．H2/G(I:o1m)J(k+c6Q2A6T0o1}
D．CO2/G(I:o1m)J(k+c6Q2A6T0o1}