Report copyright - NACHI-BUSINESS - nachi-fujikoshi.co.jp · NACHI-BUSINESS news Vol.7D1 2 図2-1. すべり軸受 図2-2. 転がり軸受 図1-1. 足と地面の摩擦 図1-2. 油を垂らして運搬物を運んだ古代の様子
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