统一的直接存取标准 unified direct access standards
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但如果不知道有效自由度是否大于10，而直接取扩展不确定度等于两倍的合成标准不确定度是存在疑虑的。
But if we are not sure about whether the effective freedom degree is more than 10, it is doubtful that selecting expanded uncertainty as twice as combined standard uncertainty.
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