error box错误框errorn.错误；过失；误差；谬误error of destination终点误差Error Analysis Study错误分析研究error voltage vector误差电压矢量error analysis steps错误分析步骤error rate of system系统误码率error rate estimator错误率估计器error of aggregation综合误差error control system错误控制系统error of measurement测差,测量误差error rate of keying安键误差率,按键误差率