单项选择题
A.900℃ B.1000℃ C.1100℃ D.1200℃ E.1300℃
A.1/3~1/2 B.1/4~1/2 C.2/3~3/4 D.1/5~1/3 E.1/2~3/4
A.1~2小时 B.2~4小时 C.6~8小时 D.12小时 E.24小时
A.3~5mm B.1~2mm C.5~10mm D.10~20mm E.30mm
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