单选题:混凝土拆模时,混凝土的表面温度与中心温度之间、表面温度与外界气温之间的温差不超过(  )。

题目内容:
混凝土拆模时,混凝土的表面温度与中心温度之间、表面温度与外界气温之间的温差不超过(  )。 A.10℃
B.20℃
C.25℃
D.30℃

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