ផលិតផល
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, high-strength steels should be studied to greatly increase their yield point strength. In addition, new types of steels, such as H-shaped steel (also known as wide-flange steel) and T-shaped steel, as well as profiled steel plates, are rolled to adapt to large-span structures and The need for super អគារខ្ពស់ ៗ ។
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រចនាសម្ព័នដែកកឺចា