The drive tool component (100) includes alternating flutes (104) and lobes (106) and has a conicalsection (108).
驱动工具部件(100)包括交替的凹槽(104)和凸齿(106)，并且具有锥形部分(108)。
2
The lower part, the conicalsection of the furnace and other fray easily area are covered with refractory to protect the heating surface.
炉膛下部锥段以下及炉内其它易磨损部位敷设耐火浇筑料，以保护受热面。
3
Problem is the most value conicalsection the key and difficult point for high school maths problem, is generally and other content combine comprehensive problem.