题目内容
（请给出正确答案）
[多选题]
第 31 题：动力学分析中，时域分析和频域分析的区别是（）
A.时域分析是以频率轴为坐标表示动态信号
B.时域分析是以时间轴为坐标表示动态信号
C.频域分析是以时间轴为坐标表示动态信号
D.频域分析是以频率轴为坐标表示动态信号
答案
BD
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
答案
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.时域分析是以频率轴为坐标表示动态信号
B.时域分析是以时间轴为坐标表示动态信号
C.频域分析是以时间轴为坐标表示动态信号
D.频域分析是以频率轴为坐标表示动态信号
答案
BD
如果结果不匹配，请 联系老师 获取答案
更多“第 31 题：动力学分析中，时域分析和频域分析的区别是（）”相关的问题
A.汽车的门,缓冲器,车架,悬挂系统的
B.承受各种随时间变化的载荷的结构,如桥梁,建筑物
C.承受撞击和颠簸的家电和设备
D.爆破导流片
A.时间步长越小,则计算精度越高
B.太大的时间步长会导致高阶模态的响应出错,从而影响到整体的响应
C.太小的时间步长会浪费计算资源
D.太大的时间步长会浪费计算资源
A.旋转设备（如压缩机、发动机、泵、涡轮机械等）的支座
B.大气载荷作用下的飞机部件
C.大型结构的地震载荷
D.飞机电子封装
根据以下材料回答第 31～35 题：
Passage OneLaura was married for 6 months. Her husband was using drugs. She didn’t want her son or her unborn baby to live that way , but she was afraid to ask her husband to leave. She left him a note instead . After reading the note, Laura’s husband waited for her to come home and then beat her and her son.
Laura had little education and she never had a good paying job. She was ashamed to ask for help from the police,courts or women’s shelters. Sometimes her husband was very nice to her. She decided to try harder so her children could have a home and a father. Laura joined a church and told a priest about her problem.
But her husband kept using drugs and hurting the family . Finally, she told her husband she loved him, but they should live apart for a while. He beat her again. The priest came over to talk to her . He asked the husband to go out for a while. Laura packed up her things and left home with her son. The next day she lost the baby. Her husband went to jail.
Laura got a lot of help from groups that help women who have been beaten . Now she is in college, has her own apartment and works on special projects at a women’s shelter. “We got out ,and it changed life for me and my child. You can do it . You can break the cycle ,”Laura said .
第 31 题 Laura felt her children shouldn’t live the old way when she was _________ .
A．pregnant
B．taking drugs
C．just out of work
D．attending university
试计算中心频率f0和带宽BW,画出其选频特性。
