After modified design, the M-827 measuring rule used to measure step diameter can measure the actual dimension deviation of machined parts directly and quality of the parts is improved too.
改进设计的M—827止口直径测量尺能够直接测量出被加工零件的实际加工尺寸偏差，提高零件加工质量。
Methods: Prepared the monodisperse and big diameter crosslinked polystyrene microspheres with Two Step Swelling Method, Using diVinylbenzene as the crosslink agent.
方法：以苯乙烯为单体，二乙烯苯为交联剂，采用二步溶胀法合成单分散、大粒径的聚苯乙烯高分子微球。
Measurement of vascular centerline and diameter is a fundamental step in diagnosing vascular diseases and planning minimally invasive surgery.
血管中心线及直径的测量是血管类疾病诊断和微创介入治疗的重要依据。
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