【題目】下列事例中，能增大壓強(qiáng)的是（ ）

A、把書包帶做得寬些 B、在坦克的輪子上安裝履帶

C、刀、斧、剪的刃磨得很薄 D、在鐵路的鋼軌下鋪上枕木

【答案】C

【解析】A、書包帶做的寬一些，增大了書包帶與肩部的接觸面積，減小了書包對肩膀的壓強(qiáng)，使人感到舒服．故A錯誤．B、在坦克上安裝履帶，增大了坦克車與地面的接觸面積，減小了坦克對地面的壓強(qiáng)，防止坦克陷入地面．故B錯誤．C、刀、斧、剪的刃磨得很薄，減小了刀刃接觸面積，在壓力一定的情況下，增大了壓強(qiáng)，便于將物體切斷．故C正確．D、把鐵軌鋪在枕木上，增大了與地面的接觸面積，減小了車對地面的壓強(qiáng)，使列車不至于陷入地面中．故D錯誤．故選C

思路分析: 題目中要求的是增大壓強(qiáng)，就要從增大壓強(qiáng)的辦法：增大壓力、減小受力面積結(jié)合選擇項(xiàng)中的措施來入手考慮

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