
[問題] 想請問三張很有疑惑的2D圖

想請教藍色框中的凹刻到底是怎麼定義尺寸的,
有沒有甚麼類似的實物範例或照片可以參考?
2.
https://images.plurk.com/1VnvkOaVRrjAtsa8OBWLXZ.jpg

紅圈處的凹陷不知道要怎麼靠3D繪圖軟體重現特徵,
原本以為是一個斜70度的圓柱體體除料,結果被說這樣不對,
應該是"雙球體"(?) 但是查不太到關於此幾何的資訊
3.
https://images.plurk.com/31DJ6o4AIXHNmkK9U6pwdW.jpg

其實這張圖幾乎是全部看不懂了,
這是模具放電加工用的零件嗎?
想請問是怎麼定義它的三視圖的
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