The rudder device keyway to hole keyway , Hole of the conical hole, Not run through the holes, Moreover structure of two key connection , Large size , High precision machining.
舵装置的键槽是内孔键槽，孔为锥孔、盲孔，而且采用双键联接结构，尺寸大，加工精度较高。
The lubrication system design inside Spiral Conical Dispenser including: the total theory, the key and the design for Dispensing Ring, the strength checkout of the hollow axle and etc;
出灰机内注油系统设计：总体原理、分配环设计与关键、空心滚轮轴强度校核等；
Problem is the most value conical section the key and difficult point for high school maths problem, is generally and other content combine comprehensive problem.
圆锥曲线最值问题是高中数学中的重点和难点问题，一般是和其他内容联合起来的综合题。
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