... Working height（（length）：工作高度（长度）弹簧承受工作负荷时的长度（高度）的变化不能恢复的部分称为永久变形，能恢复的称为暂变形或滞弹性变形 closed and ground ends： 磨平闭收口 Close-wound：密身 ...
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Ends closed and ground flat 两端闭合并磨平
We produce: Standard compression springs, conical springs, and barrel springs all with open, closed, ground, or special ends if required.
我们生产标准的压缩弹簧，锥形弹簧和柱形弹簧，有开放式的，闭合式的，接地的，如有需求，也有特殊的端口。
The results show that a part of closed ends of the tubes were broken and graphite layer of some nanotubes were tortured while ground for 8h.
实验结果显示球磨8小时后原碳纳米管的封闭端头被打开，并在纳米管壁上产生了扭曲变形的石墨层。
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