问题
单项选择题
B级分隔应具有在规定的时间内，使背火一面的平均温度升高不超过（），且在任何一点的温度较原始温度升高不超过（）。
A.140℃，225℃
B.225℃，140℃
C.140℃，180℃
D.180℃，140℃
答案
参考答案：A
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B级分隔应具有在规定的时间内，使背火一面的平均温度升高不超过（），且在任何一点的温度较原始温度升高不超过（）。
A.140℃，225℃
B.225℃，140℃
C.140℃，180℃
D.180℃，140℃
参考答案：A
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