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Author(s): Je-hyun Lee, Taihoon Kim, Yong-Chae Chung
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Columnar or ortholinear keyboards stack the keys in orderly columns, often with rows that are not linear. Proponents claim this makes the keys easier to reach. Whether that’s true will be up to your fingers to decide, but I can say for certain that if you learned to type on a staggered keyboard, switching to a columnar layout is tough. It will take days, possibly weeks before you instinctively hit the C key. The N, M and B keys don’t fare much better.
3. 地下室混凝土存在漏筋、渗水、涨模等质量问题。（违反《混凝土结构工程施工质量验收规范》（GB50204-2015）第8.2.2及《地下防水工程质量验收规范》GB50208-2011第3.0.1条。）