rack nut
... Rack link齿条联接杆 Rack nut齿条螺母 Rack shaft齿条 ...
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齿条轴承螺母 rack bearing nut
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目前，三峡升船机引入德国技术，拟采用齿轮—齿条爬升机构、长螺母柱—短螺杆安全机构。
It is supposed to introduce the technology of gear-rack driven mechanism and nut-screw safety mechanism from Germany.
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