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1·The locating slot at bottom of base and ribs on two sides of extended tail part of low chassis as well as bent and extended from top are superposed and fixed each other.

所述基座底部的定位槽与下机壳尾部两侧及顶端折弯并延伸的肋重合并固定。

2·A locating slide block capable of sliding and locating is arranged inside the slide block slot.

该滑块导槽中设置有可滑动并定位的定位滑块。