5. From the characteristic of harmonic relief patterns, the a thermalization and achromatism of harmonic diffractive element have been studied in the paper.
从谐衍射元件的理论出发,讨论了谐衍射透镜在消色差和消热差时的特性。
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6. The method for determine sewage's chroma is method of dilution multiple. It's easy to bring in error when using eyes to determine the diluted sample is whether achromatism or not.
污水色度的测定一般采用稀释倍数法,该方法在用人眼判定稀释后的水样是否接近无色时容易引起误差。
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7. The method for determine sewage's chroma is method of dilution multiple. It's easy to bring in error when using eyes to determine the diluted sample is whether achromatism or not.