神马品牌网双层dvd刻录光驱:两道不会的物理题目，谁可以帮忙？
来源：百度文库 编辑：神马品牌网 时间：2024/05/03 10:57:06
Explain how a large force is produced when the pile is driven a short distance into the ground?
The equuipment design is changed so that when the mass falls once,the pile is driven further into the ground than before the design was changed .Suggest three changes that could be made to do this?
The equuipment design is changed so that when the mass falls once,the pile is driven further into the ground than before the design was changed .Suggest three changes that could be made to do this?
还是进口题呀？！
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你这是物理吗