短語詞組短語spread d footing 擴底基礎(chǔ)square spread footing 方形獨立基礎(chǔ)Spread Footing Foundation 擴展基礎(chǔ)independent spread footing 獨立擴展式基礎(chǔ)spread footing WESTBANK 展式底腳 返回 spread footing