欧美精品在线视频,一级毛片无码无卡无遮挡,密臀av免费线观看,激情淫荡少妇人妻视频

Foshan Steel How to waterproof? Weather annual rainfall in Guangdong, Zhejiang and other coastal areas than more, if you do the steel structure housing, but not ready for the water leak, a rainy day often leaking, this is a very bad headache , very ...

Which should set the stage Guangzhou Steel subheading? Guangzhou Steel should set the stage subheading?There is no specific quota subheadings steel stage, only taking a similar scale, Guangzhou Steel steel weight calculated taking cash in fixed stee...

Guangzhou Steel teach you: how to improve the fire resistance of steel structures How to improve the fire resistance of steel structures?Guangzhou Steel due to poor fire resistance, high temperature at fire will expire soon collapsed, the fire resis...

Guangzhou Steel tells you: What is the principle of fire fireproof coatings is What is the principle of fire fireproof coatings is?Guangzhou Steel tells you: Guangzhou fireproof coatings fire principle, there are three: First, the coating of steel s...

Guangzhou Steel teach you: construction steel structure fire safety measures in the general provisions 1, the first steel construction, should be the appropriate fire safety management system.2, on-site construction work shall be approved by fire au...

Guangzhou Steel teach you: General steel construction hole and limb protection 1, the side length or diameter of the hole should be 20cm ~ 40cm rigid protective cover plate; edge length or diameter of the hole should be 40cm ~ 150cm erection of stee...

Guangzhou Steel teach you: measuring plane control Steel Works 1, the distribution network site plan guidelines Control NetworkAfter the site plan control network should be fully taken into account in accordance with the guidelines planning position...

Guangzhou Steel tell you: with aluminum foil steel wool carpets how? Wool carpets are laid web to adapt to the needs of large and made of, in addition to adhere to the characteristics of thermal insulation, but also has excellent damping, sound abso...

Guangzhou Steel teach you: how to choose exactly Steel Marine rock wool insulation board A major expansion at first-class fire rock wool board for the wooden structure, due to the poor weather for outdoor use, easy to aging, from the skin, in the we...

Guangzhou Steel specify the contents of the convergence of high strength bolts 1, anti-slip coefficient is one of the main planning parameters of convergence of high strength bolts, directly affect the bearing capacity member, and therefore member f...

Design counseling knowledge: seismic design of frame column stirrups set there? Seismic design of frame column stirrups set there?1, stirrups should be enclosed, its ends should be made of 135 ° hooks and hook end of the straight length of not less ...

Fireproof coatings classification and construction methods     Fireproof paint coating species divided by thick steel structure fire retardant coating and thin steel two fire retardant paint, according to zoning indoor and outdoo...