国产成人禁片在线观看,精品国产99久久,国产欧美亚洲三区久久,日韩视频久久99天堂

1. Steel parts and steel components processing requirements:  Cutting surface or cut surface of steel, should be no cracks, slag, stratification and greater than 1 mm of missing edge, should fully checked.Carbon structural steel at ambient tempe...

1 Definition  Steel bolt is a kind of high-strength bolts, also standard parts. Fastening performance is better, for the steel, engineering, fastening action. General steel, steel bolt requirements are more than 8.8, there are 10.9, 12.9, and ar...

 First: the jet or projectile rust, with Sa expressed.Can be divided into four levels:    (1)Sa1 grade mild sand-blasting the surface should be no visible dirt, grease and attachment is not strong oxide, paint coating layer, rust and ...

Structural design knowledge: What are the advantages and disadvantages of steel structures? What are the advantages and disadvantages of steel structures?Steel features:(1) high intensity, high weight ratio; good ductility, toughness;(2) Material un...

Structural design knowledge: What are the applications of steel? What are the applications of steel?(1) heavy-duty construction and long-span structures;(2) a multi-layer, high-rise and high-rise building construction;(3) light steel structure;(4) a...

Foshan Steel Description: Steel 1, the steel as an ideal plasticity, is in accordance with previous fy ideal elastic steel exile after fy, plastic strain and stress remain the same large-scale near-perfectly plastic.2, sincerity tension members shou...

Features steel sandwich panel Color steel sandwich panel has:1, light weight, weighing less than 14kg square structural load can be sufficiently reduced, reducing structural costs.2, quick installation, the light weight composite panels, mosaic inst...

Foshan Steel: Steel truss installation procedures and order and precautions Truss installation method and scope as follows:1) High Altitude in Bulk: for all types of nodes connected grid, and should adopt the cantilever construction method less brac...

Steel construction safety equipment production skills are as follows: 1 using a mobile crane lifting member, shall determine the crane out of the scene of the road and working crane two addresses and working height requirements, the boom length and...

        Drawings should be carried out before the installation of steel joint hearing before the joint hearing of construction units should be familiar with and master design file contents, find the component mounti...

Steel manufacturing precision engineering and manufacturing items intent (ie promised error) in the "war construction and inspection standards and other related standards have made ​​specific rules, this section will not repeat, but we ha...

Steel structure construction method is probably the following: Constructs, trusses, truss structure and lattice shell structure, portal frame, such as stents. When constructing selection, should summed thinking, all compared to the qualitative anal...