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A low-density type of concrete throughout which small air ...
A low-density type of concrete throughout which small air ...
Reinforced concrete is concrete in which reinforcing bars ...
A convex grind is the opposite to the hollow grind, the ...
The Belgian national football team has represented Belgium ...
A 1.6 ton homemade submarine mostly assembled from metal ...
A three-wheeled automobile self-made by a 47 years old ...
Invented by Farmer Wu Yulu in a village outside of ...