当烘烤铸圈的温度升至400℃时,尚需维持 ( )A.1h B.5min

考试题库2022-08-02  27

问题 当烘烤铸圈的温度升至400℃时,尚需维持  (    )A.1hB.5minC.30minD.10minE.2h

选项 A.1h
B.5min
C.30min
D.10min
E.2h

答案 C

解析
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