ConclusionThe homograft aortic valves cryopreserved by modified two-step method have a good long-term effect in clinical application.
结论改良两步法保存的带瓣主动脉临床应用具有良好的远期效果。
Based on modified Arrhenius formula, an integral method and a two-step regression method for storage life prediction of solid propellant are presented.
在修正的阿伦尼斯公式基础上，提出固体推进剂贮存寿命的整体预测方法和两步回归预测方法。
Stable epoxy-styrene-acrylic aqueous dispersion modified with siloxane was prepared with a two-step synthetic method.
通过两步法合成了稳定的硅氧烷改性环氧-苯丙树脂水分散体。
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