This paper presents the mathematical model and coding principle of cyclic redundancy check, and show the software implementation.

论述了循环冗余校验的数学模型以及编码原理，并给出了软件的实现方法。

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Therefore, a downhole tool that can reduce the annular cyclic pressure loss and introduced its structure, principle of work and technical parameters were put forward.

提出了一种减小钻井泥浆环空循环压耗的井下工具，介绍了该工具的结构、工作原理、技术参数。

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The principle of estimating the cyclic performance of carbon negative electrode materials in LIB with the powder microelectrode cyclic voltammetric method was illustrated.

阐明了采用粉末微电极循环伏安法估测锂离子电池（LIB）炭负极材料的循环性能的原理。

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