单项选择题
A.500kg B.510-530kg C.530-540kg D.600kg
A.730~860℃ B.950~1000℃ C.1050~1100℃ D.1100~1200℃
A.730~860℃ B.950~1000℃ C.1000~1050℃ D.1050~1100℃
A.5% B.10% C.15% D.20%
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