是董小姐呀
Why does this place get bigger and bigger?
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wangliang
Q345r Open Plate in Pressure Vessel Application What Requirements..
专业蓝领30年
Which thickness is the heat preservation time of long neck flange box calculated by?..
阳光boy
What is the allowable fluctuation range for holding pressure for a long enough time? Where..
zhaolin
& What is the nominal diameter of phi; 51 pipe?..
litian
Ask, what is the overpressure limit in SW6 and what does it mean?..
小鱼曾乖乖
Who knows why Jinlin sheet metal unfolding map can not be transferred to cad?..
是董小姐呀
Consult me, stress analysis equipment write welding joint coefficient..
专业蓝领30年
GB150 revised document said that it should not be used for heat exchanger tubes of shell-a..
zhaolin
What I want to say is, at present, A1A2 qualifications. Next year, if you need A3 qualific..