长度为L、惯性矩为Is的轴两端各带有惯性矩为I0圆盘（单位厚度），求轴和圆盘组成的扭振系统的频率方程，并在Is<0的情形下校验频率方程的正确性。

A . 正确 B . 错误

A . A．1/4 B . B．1/9 C . C．1/16 D . D．3/4

A .https://assets.asklib.com/images/image2/2018071614235934105.png B .https://assets.asklib.com/images/image2/2018071614251795925.png C .https://assets.asklib.com/images/image2/2018071614253655148.png D .https://assets.asklib.com/images/image2/2018071614255786608.png

A . I =3πd ／32 B . I =πd ／64 C . I =0 D . I =-πd ／16

A . 1564.9 B . 1711.4 C . 1956.2 D . 2094.8

A . A B . B C . C D . D

A . 0.05 B . 0.08 C . 0.10 D . 0.15

A . 正确 B . 错误

A . A．0.05 B . B．0.08 C . C．0.10 D . D．0.15

A . A B . B C . C D . D

A .https://assets.asklib.com/images/image2/2018071614235934105.png B .https://assets.asklib.com/images/image2/2018071614251795925.png C .https://assets.asklib.com/images/image2/2018071614253655148.png D .https://assets.asklib.com/images/image2/2018071614255786608.png

A．bh³/12 B．bh²/6 C．bh³/4 D．bh³/3

图示变截面细长压杆，横截面A的惯性矩为I₀，x截面的惯性矩为<img src='https://img2.soutiyun.com/ask/2020-11-09/973780783337894.jpg' />，设压杆微弯平衡时的挠曲轴方程为<img src='https://img2.soutiyun.com/ask/2020-11-09/973780836786775.jpg' />，式中，f为压杆自由端的挠度。试利用能量法确定压杆的临界载荷F_α。 <img src='https://img2.soutiyun.com/ask/2020-11-09/973780904988172.jpg' />

A．<img style="backface-visibility: hidden; border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: curr

<img src='https://img2.soutiyun.com/shangxueba/ask/18987001-18990000/18989931/2016071910353680984.gif' /><img src='https://img2.soutiyun.com/shangxueba/ask/18987001-18990000/18989931/2016071910354280288.jpg' /> A．A B． B C． C D． D

A．1340 B．1100 C．1560 D．1780

A．对称轴 B．形心轴 C．水平轴 D．任意轴

A．I₀ B．1．2I₀ C．1．5I₀ D．2．0I₀