单项选择题
A.1100-1150℃B.1150-1200℃C.1200-1250℃D.1300-1325℃
A.850B.950C.900D.800
A.1:2.5B.1:3.2C.1:2D.1:3
A.1150-1200℃B.1050-1200℃C.1100-1150℃D.1100-1200℃
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