A.0.5~1/min B.0.5~1.5L/min C.1~1.5L/min D.1.5~2L/min
A.1050℃ B.1150℃ C.1200℃ D.1250℃
A.950~1050℃ B.1050~1150℃ C.1150~1250℃ D.1250~1350℃