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.

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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.

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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.

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