And then, the mathematics model was firstly set up to analyze the force that the rotary control head endured when the preventer installed aslant.
并在此基础上通过建立力学数学模型完成旋转控制头在安装偏斜的情况下的动力学分析。
As the key part of the rotary control head's bearing assembly, the capability of the rotary dynamic seal equipment effects on the using life of the rotary control head.
旋转动密封装置是旋转控制头轴承总成的关键部件，其性能好坏直接影响旋转控制头的使用寿命。
The electric toothbrush comprises a protecting cover, a rotary brush head, a rotating shaft, a power handle and a control switch.
它包括保护罩、旋转刷头、转轴、动力手柄和控制开关。
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