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1. |
In 1886, Jackson of San Francisco applied for a patent in which prestress was introduced by: |
A. | Tensioning the reinforced rods in sleeves |
B. | Tensioning the reinforced rings in sleeves |
C. | Tensioning the reinforced steel in sleeves |
D. | Tensioning the reinforced bars in sleeves |
Answer» B. Tensioning the reinforced rings in sleeves | |