an orthogonal test design 设计正交试验
The gas nitriding technology of H13 steel was studied by an orthogonal test.
运用正交试验法，研究H13钢气体渗氮工艺。
A kind of mid temperature phosphating solution with high corrosion resistance was prepared by an orthogonal test.
得到一种高效、高耐蚀性、稳定、实用、无污染、低成本的中温磷化液。
Methods With the lead-removing rate as an index, the ratio of mungbean powder, Lycium chinensis Mill powder, jujube powder and licorice powder was optimized by an orthogonal test.
方法采用正交试验，以排铅率为指标，优选绿豆粉、枸杞粉、大枣粉、甘草粉的用量。
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