It is proved theoretically that changing lead Angle is the best way to control the turn staying time of material.
从理论上证明了改变导程角是控制物料旋留时间的最有效的方法。
Then it is demonstrated that the substituting airstream in spray dryer average staying time for the material drying time is reasonable.
论证了以干燥塔中气流平均停留时间作为物料干燥时间的合理性；
The utility time of antibiotics, the retain time of thoracic duct, and hospital staying time were significantly shorter in thoracoscopic surgery group.
应用抗生素时间，胸管留置时间及住院天数胸腔镜手术组亦明显较剖胸术组短。
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