作案者往往通过漏扫商品或键入错误单价的方法作案，他们也能绕过条码转换装置，小偷们往往将原有的条码撕掉，而换上一件便宜商品的条码。
It also overcomes bar-code switching, in which would-be thieves remove the original bar-code and replace it with that of a cheaper item.
通过对三个管件的裂纹部位的检测实验，找出裂纹宽度与漏磁场的最大值和变化梯度之间的关系。
Through the examination experiment on three tube pieces' crack part, the relation of crack width, the maximum of leak magnetic field and differential coefficient is found out.
以经爆破试验的四件小钢管件裂纹为研究对象，找出裂纹宽度与磁记忆信号的关系，得出漏磁场变化梯度的最大值随裂缝宽度增加而增加。
Through the examination experiment on four tube pieces crack part, the relation of crack width, the maximum of leaking magnetic field and differential coefficient K is found out.
为了对密封件的漏孔提出定量分析的概念，举例说明了漏孔漏率的计算步骤。
An example illustrating the procedure of calculating the rate of leakage of the leak holes is proposed to give a concept of quantitative analysis of the leak holes in seals.
为了对密封件的漏孔提出定量分析的概念，举例说明了漏孔漏率的计算步骤。
An example illustrating the procedure of calculating the rate of leakage of the leak holes is proposed to give a concept of quantitative analysis of the leak holes in seals.
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