The structure and properties of flat section and circular polyester filament were studied through measuring birefringence, sonic modulus and work coefficient ect.
对扁平形聚酯纤维和圆形聚酯纤维的结构和性能进行了研究。
Effect coefficients of the response spectra flat section values of three kinds of soil layer constructions were found by comparing the average values with those of the normal profiles.
通过与正常剖面的反应谱平台值比较，给出了三种土层结构的反应谱平台值的影响系数。
Under the condition of a minor space, the utility model enables a flat section workpiece with a light section to change from horizontality into erectility under the function of screws (3).
本实用新型能在较小的空间情况下，使小断面扁形轧件在螺旋（3）的作用下由水平状态变成直立状态。
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