此款稳踏椅采取了独特的弹簧更换系统，可以更便捷的改变动作难度，同时也有效的保护了器材。
This section trod the chair to adopt the unique spring replacement system steadily, might the more convenient change difficulty of movement, effective protection of equipment.
方法：根据CEREC 3d椅旁修复系统的特殊性，对修复前的准备、诊疗中的护理配合、修复后的护理进行总结。
Methods According to the specificity of CEREC 3d, restoration system, we summarized the pre-prosthetic preparations, nursing works in the process, and care procedures after restoration.
文章还对拖拉机乘坐舒适性研究中的人—椅系统分析模型和计算机模拟设计问题作了简单介绍和分析讨论。
Operator-seat system analysis and computer modelling and simulation programs in tractor ride vibration research are also simply introduced and discussed.
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