分别用4单元和16单元有限元法求解左端固定、右端自由的等直杆（截面积为 ，弹性模量为 ，密度为 ，杆长为 ）在1/4杆长处的稳态响应并与精确解进行对比（假设1/4杆长处集中载荷 激励）（要求MATLAB编程计算，附程序清单）

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