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。
Upper step wedge and lower pass-line adjustment unit serve to compensate wear of WR diameter and BUR diameter.
上阶梯垫装置和下轧制线调整装置是补偿工作辊和支撑辊直径磨损减小的装置。
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