氧气的主要用途之一是请选择ABCD,o(h7A*L'a)J0k'a:D.g,g,?(Z([2~'W3v*X6O3Q:`*Z1s4Z0T*S2k7o
A．做还原剂2~'W3v*X6O3Q:`*Z1s4Z0T*S2k7o
B．做燃料2~'W3v*X6O3Q:`*Z1s4Z0T*S2k7o
C．炼钢2~'W3v*X6O3Q:`*Z1s4Z0T*S2k7o
D．灭火2~'W3v*X6O3Q:`*Z1s4Z0T*S2k7o