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问题：
[单选题]《暖通规范》规定,我国北方城市的供暖室外计算温度值是( )
A、采用历年平均不保证5 天的日平均温度。
B、采用历年平均不保证4 天的日平均温度。
C、采用历年平均不保证 3天的日平均温度。
D、采用历年平均不保证2 天的日平均温度。
参考答案：
A
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