测试研究了有代表性的14种不同材质、不同截面几何形状及尺寸大小的纤维材料；
The sound-absorbing coefficients of 14 typical fiber Materials with different geometrical cros-section forms and sizes are measured and studied.
对污杂物的性质、形状以及分级浓度进行了定义，并通过实验在典型时段对哈尔滨市两处具有代表性的污水干渠进行了现场测定。
Characters, shapes and stage concentration of the contaminant were defined; and two representative drain pipes in Harbin was been measured by field experiment.
把一些具有复杂形状的零部件采用模具生产将大大提高生产效率，本文就是通过对一个具有代表性的零件进行研究，达到掌握模具设计和制造生产的方法。
The complex parts are produced by means of mould, which improves production efficiency. By the research we can master the way of mould design and produce.
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