单项选择题
A.520℃~860℃B.620℃~860℃C.720℃~860℃D.820℃~860℃
A.150℃~1200℃B.160℃~1200℃C.170℃~1200℃D.180℃~1200℃
A.COB.CO2C.CO3D.CO4