Substratum,hemi-spherical 5!}xl9D Flatness L/2 @633 nm on flat surface or better(specify). ye KzI~ Figure irregularity L/10@633nm. 8NudY3cU! no chips exceeding 8HX(1nNj} Thickness specified at the edge, all types. .a:"B\B` Substratum BK7 D20×5 PCX f+ 300 mm 7A8jnq7m/ 有哪位哥哥姐姐懂的,帮忙翻译一下,诚谢!!