Experiment: Pull items of the same weight but different base area with a spring scale over an identic surface - the tractive force will be the same!
实验：同样的重量，但不同的根据地一个弹簧秤同文面拉项目-牵引力将是相同的！
Experiment: Pull items of the same weight but different base area with a spring scale over an identic surface - the tractive force will be the same!
实验：同样的重量，但不同的根据地一个弹簧秤同文面拉项目-牵引力将是相同的！
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