The uncertainty components and standard uncertainty caused by background gas were evaluated with the direct evaluation method in detail.
采用直接评定法对背景气体引起的不确定度分量、标准不确定度进行了评定。
The results suggested that the direct evaluation method for early wear of restorations would be less sensitive, but it remains the preferred system for the evaluation otherwise;
结果表明，直接法对修复体早期磨耗的评估不敏感，但对修复体其它方面的评价目前仍为首选；
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