问题
单项选择题
当焙烧铸圈的温度升至900℃时，需维持()
A．10min
B．5min
C．15～20min
D．1h
E．2h
答案
参考答案：C
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当焙烧铸圈的温度升至900℃时，需维持()
A．10min
B．5min
C．15～20min
D．1h
E．2h
参考答案：C
| 从方框中选择最佳选项完成对话，有两项多余。 | |
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