Which of the following countries was the first to use iron structures in the world?
America
B. China
C. British
D. Egypt
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The material requirements of steel structures are ( ).
A. High tensile strength and yield strength
Better plasticity and toughness
C. Good process performance
D. Weak corrosion resistance
Ferrum content accounts for steel is ( ).
A. 90%
B. 95%
C. 99%
D. 100%
Welded I-section beam webs are provided with transverse stiffeners, the purpose is ( ).
A. Improve the bending strength of the beam
B. Improve the shear strength of the beam
C. Improve the overall stability of the beam
D. Improving the local stability of the beam
Age hardening can increase steel ( ).
A. Weldability
B. Strength
C. Toughness
D. Plasticity
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