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答:在做焊盘时插件钻孔有三种模式:Circle Drill、Oval Slot、Rectangle Slot。在焊盘编辑器中制作钻孔时时,可以选择如图4-29所示: 图4-29 钻孔属性三种模式选取示意图 Ø Circl Drill:圆形钻孔,如下图4-30所示: 图4-30 圆形钻孔示意图 Ø Oval Slot:椭圆形钻孔,如下4-31所示: 图4-31 槽孔钻孔示意图 ...
The Circle DrillBreanne Hill
This article introduced the superiority of double-wall drill pipe reverse circulation air drilling. 介绍了双壁钻杆反循环空气钻井的优越性,根据双壁钻杆的内管直径,从理论上分析了反循环钻井满足携带岩屑需要的最低注气量,又根据双壁钻杆的结构和空气介质反循环钻井的流程分析计算了一定注气量与注气压力之间的关...
Define vertical circle. vertical circle synonyms, vertical circle pronunciation, vertical circle translation, English dictionary definition of vertical circle. n. See meridian. American Heritage® Dictionary of the English Language, Fifth Edition. Copy
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