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zhaolin 2020-07-23

With the depth of the groove to be and what area ~ ~ that several data calculated by SW6 i..

How to layout elliptical head 1 0

gr888 2020-06-28

Women's volleyball team won, the Olympic Games is over, ask you a question! On the ellipti..

wangliang 2020-06-15

Have you seen this? This is a layered partition? solve
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一路向东 2020-05-29

I would like to ask if the two piece of the flange sealing surface is not parallel, there ..

litian 2020-05-11

Dear God, consult a problem. There is no standard on the surface of the flange sealing sur..

zhaolin 2020-04-27

Ask online experts how to calculate the buckling strength of external pressure vessels. Th..

TuKai 2020-04-02

哪位朋友有AS1657的设计标准，能分享一下吗..

wangliang 2020-03-26

请教一下，国家有没有建设焊材一级库和二级库的相关标准？就是以什么依据建设焊材库？..

海阔天空 2020-03-23

波纹管的固定管板换热器是否必须要有膨胀节啊

Electronics of Nb / t47014 ~ 47016-2011 0 0

big yang 2020-03-16

请问哪位有NB/T47014~47016-2011的电子版，发一份给我，谢谢！..

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