可生产口径φ219～φ3420㎜,壁厚δ4～δ25㎜的双面
x^\mu\\ \phi(x)&\rightarrow &\phi'(x')=\phi(x) \delta \phi
phiztd.png
times like these, your black brothers are also blue - phi delta
《阿佛洛狄忒》(αφροδτη,满眼
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