The orthogonal test design method is very suitable to be popularized and applied in minor enterprises because of its features of scientific method, easy operation, lower cost and striking effect.

正交试验设计法以其方法科学、操作简便、费用节省、效果显著等特点，十分适合在小企业推广运用。

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Therefore, choose the best suitable method to back-up the electronic documents in safety, efficiency and operation has become a new research topic.

所以要在安全、效益、运行等方面选择最合适的备份方式对电子文件进行备份已经成为新的研究课题。

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This method has the advantages of convenient operation, time saving, and high accuracy and precision, suitable for the determination of the urea content in slow-release urea.

该法具有操作简便、省时、 准确度高、 精密度好等优点，适合于测定缓释尿素中的尿素含量。

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