It will not return an error to standard output if the file is not found. One way to test the return of the command is to use substitution, like shown in Listing 8.
即使找不到文件，它也不会向标准输出返回错误。
Because the traditional calibrating method is not suitable for testing optical electric current transformer, a novel test system is designed based on the IEC standard and error analysis theory.
鉴于传统的电流互感器测试方法已经不适于校验新型的电流互感器，依据IEC标准和误差分析理论，提出了光电电流互感器的测试和校验方法。
A new tool that can test the clock base frequency error of energy measuring devices and provide GPS standard time to calibrate real-time clock was introduced in this paper.
介绍了一种用来测量电能计量装置的时钟基频误差，并提供GPS标准时间以校准其实时时钟的新型工具。
The influence of "non-standard accuracy" must be considerd among the key error factors of coaxiality of turnover boring, except the list errors in the standard of test accuracy;
影响调头镗孔同轴度的主要误差因素中，除机床精度标准中规定检测的有关误差项外，精度标准中未被列入检测的相关“非标误差”也有重要影响。
The kernel method of test equating has five steps, including presmoothing, estimation of test score probability, continuation, equating and calculation of standard error of equating.
一般说来，核等值法有五个步骤，分别是前平滑处理、估计分数概率、连续化、等值、计算等值标准误。
Under this background, the author research on the Error Analysis and Establishment of Test Standard of time granting. The mainly research content as follow:1.
在此背景下，本文作者在一项自然基金的资助下，开展了《时栅位移传感器环节误差分析和检验标准的建立》的研究。
Under this background, the author research on the Error Analysis and Establishment of Test Standard of time granting. The mainly research content as follow:1.
在此背景下，本文作者在一项自然基金的资助下，开展了《时栅位移传感器环节误差分析和检验标准的建立》的研究。
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