double action roller 双动揉捻机
single action roller 单动揉捻机
double-roller safety action 双圆盘保险装置
roller action 揉捻机作用力
Some papers have put forward the lateral scraping action results of the roller bits, which are quantitatively inaccurate and qualitatively defective.
一些文献就不同结构的钻头各有何种横向刮凿作用的问题提出的答案，既不能准确定量，在定性概念上也有严重缺点。
The present invention relates to a kind of roller type massage health device with pulse magnetic therapeutic action.
本发明属于一种磁疗健身装置，特别涉及于一种具有脉冲磁疗作用的滚动轮式按摩健身装置。
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