Objective To investigate the prevalence of dental carries in persons of a navy special operation force.
目的了解海军特勤人员龋病流行病学情况。
With special bearing, high sensitivity, nylon sealing device and anti collision device, which can effectively reduce the impact force and ensure the stability of the operation.
采用特制轴承，滚轮灵敏度高；尼龙密封装置及防撞装置，有效减缓冲击力，确保运行的稳定。
With special bearing, high sensitivity, nylon sealing device and anti collision device, which can effectively reduce the impact force and ensure the stability of the operation.
采用特制轴承，滚轮灵敏度高；尼龙密封装置及防撞装置，有效减缓冲击力，确保运行的稳定。
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