The drive tool component (100) includes alternating flutes (104) and lobes (106) and has a conical section (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)。
The lower part, the conical section 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。
Their conical sphenoid part, for the configuration of which at least four conical surfaces are used, can have the same cross section all over its length or different cross-section per parts.
圆锥楔形体的结构至少有四个圆锥面组成，在每个面上，可以使用相同的横截面，也可用不同的横截面。
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