单项选择题
A.63%-85% B.73%-95% C.70%-75% D.70%-90%
A.0.4 B.0.5 C.0.55 D.0.6
A.1150-1200℃B.1200-1280℃C.1280-1320℃D.1320-1380℃
A.650℃;6~30% B.700℃;40~70% C.550℃;40~70% D.700℃;5~15%
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