2. The plastics engineers were in a constant effort to improve the distributive and dispersive mixing performance of the single screw extruder for many years. 为改善单螺杆挤出机的分散和分布混合能力，国内外塑料工程师们多年来进行了不断的努力。
3. A compact micro beam X-ray fluorescence spectrometer, which consists of monolithic polycapillary X-ray focusing lens and energy dispersive X-ray spectrometer, is introduced. 介绍了一种小型的微束X射线荧光分析谱仪，它是由导管X光透镜和能量色散X射线荧光分析谱仪组成。
