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当前学科：1C412000铁路工程材料
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当混凝土生产条件能在较长时间内保持一致，且同一品种混凝土强度变异性能保持稳定时，可采用（）评定。
A . 加权平均法
B . 标准差已知的统计方法
C . 算术平均法
D . 专家评估方法
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