The effect, mechanism, varieties, production at home and abroad and the application in compound and mixed fertilizer production of fertilizer wrapping agent are introduced.
介绍了肥料包裹剂的作用、原理和种类，国内外产品的情况，以及在肥料生产中的使用。
Objective:To evaluate the maxillary expansion effects of posterior crossbite patients treated with elastic wrapping bite guard and screw expansion mechanic in the mixed dentition.
目的：探讨弹性包绕式垫加螺旋扩弓器矫治替牙期后牙反的适用性及治疗前后的牙颌结构变化。
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