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並前往https://www.redi-rock.com/documents/Engineering/Specs-DataSheets/Redi-Rock-28-in-710-mm-Retaining-Blocks.pdf

Redi-Rock 28" (710 mm) Retaining Blocks

... is based on an assumed concrete unit weight of 143 lb/ft 3 (2291 kg/m3). ... V = 6,061 + N tan 44° ≤ 11,276 lb/ft (88.4 + N tan 44° ≤ 164.5 kN/m).

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