Engineer is inspecting his work in building construction site Soft focus of post tension slab in construction site Sizes: 640 × 480 / 1.024 × 768 / 768 × 576 / 1.075 × 806 / 1.536 × 1.152 / 2.048 × 1.536 / 640 × 480 / 350 × 230 / 380 × 249 / 650 × 427 / 825 × 542 / 304 × 170 / 370 × 278 / 2.560 × 1.920
