bracketing error envelope 阀配置的误差范围
If the Envelope contains the wrong namespace, an error will be generated regarding the version of Envelope namespace.
若envelope包含了错误的名称空间，会产生一个关于Envelope名称空间版本的错误。
It mostly consists of an envelope and error handling.
主要有信封和错误处理组成。
Based on the mathematical model of circularity error, the least square method, minimum envelope zone method and harmonic analysis method for evaluating the circularity error are treated.
本文根据圆度误差的数学模型，论述了评定圆度误差的最小二乘法、最小区域法和谐波分析法。
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