News perspective mainly contains approach, material selecting and expression analyzed from the news body.
从新闻主体方面分析，新闻角度主要包括立意角度、选材角度和表现角度。
So the theoretical basis is provided for optimizing achromatism of the rhomb-type retarder and the material selecting scope can be extended.
从而为优化菱体型相位延迟器的消色差性，扩大材料的选取范围提供理论指导。
An introduction is made to the elastic velvet with coarse and fine wales, including its raw material selecting, knitting, shearing, dyeing and setting.
介绍了弹力子母条天鹅绒产品的原料选择、编织、剪毛、染色及定形等各道关键工序工艺要求及技术要点。
This paper analyzed several characteristic parameters of material selecting for liner of cement mill machine, and tried to provide the basis for selecting.
通过对水泥磨机衬板选材分析，试图为衬板选材提供依据。
The chemical composition, manufacture process, raw material selecting and the performance of the asphalt-polyurethane rigid foam for insulation and anticorrosion of building were introduced.
介绍了建筑业保温防腐沥青聚氨酯硬泡体的基本配方、制备工艺、原料选择及性能指标。
The chemical composition, manufacture process, raw material selecting and the performance of the asphalt-polyurethane rigid foam for insulation and anticorrosion of building were introduced.
介绍了建筑业保温防腐沥青聚氨酯硬泡体的基本配方、制备工艺、原料选择及性能指标。
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