Just as in the freestyle, head positioning plays an important roll in the backstroke.
和自由泳一样，头部的位置对于仰泳来说也是至关重要的。
The utility model relates to a rectangular bearing block rotary positioning device used for the installation, the regulation or the replacement of a roll used for rolling metals.
本实用新型涉及用于金属轧制的轧辊的安装、调节或更换，具体为一种矩形轴承座旋转定位装置。
The utility model relates to a rectangular bearing block rotary positioning device used for the installation, the regulation or the replacement of a roll used for rolling metals.
本实用新型涉及用于金属轧制的轧辊的安装、调节或更换，具体为一种矩形轴承座旋转定位装置。
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