烘烤铸圈时升温不能过快，从室温升至400℃，升温时间不得低于 ( )A.20min B.60min C.30min D.10min E.2h

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问题烘烤铸圈时升温不能过快，从室温升至400℃，升温时间不得低于 ( )

选项 A.20min
B.60min
C.30min
D.10min
E.2h

答案B

解析

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