fixed layer meaning in Chinese

固定层
紧密层

This paper brings forward a stable inverted deduce method which point by point in fix layer , for a class of dimension elastic wave problem , and proves that the result of parameter has whole precision for this method , numercal test shows this method is effective and feasible . 1fig . , 1tab . , 7refs
针对一类一维弹性波反演问题，导出了一种稳定的定层逐点反演方法，推证了该方法的参数解具有整体二阶精度，数值试验表明，该方法是有效而可行的.图1 ，表1 ，参7
Designing and making the third grain - pests sampling device . the implemental device can sample the grain automatically in the settled dot and the fixed layer , offer equality and invariable shadowless lamp , ensure the grain monolayer passing , obtain clear grain - pests image . it can settle a good foundation for the rear image enhancement and recognition
设计、制作了第三代粮虫取样装置本工具式装置能定点、多层自动抽取粮食样本，提供均匀恒定的无影光照，保证粮食匀速单层通过，并获取到比较清晰的序列化粮虫图像，为后续的图像处理和识别打下良好的基础。