均质圆盘绕过圆心的定轴O转动,物体的质量为m,角速度为,半径为r,则圆盘对O轴的动量矩为( )。

A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1539676148022a538f2403b774135b782a9f9ed94f3ec.png" alt="上传图片"><br>

B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15396761561486165f3fe48b245cea412987f534e7dee.png" alt="上传图片"><br>

C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1539676162613092c5596efb44e7cb362bae745831d45.png" alt="上传图片"><br>

D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/153967616863837fa4d4ed8274654a62d20e8b0c5f131.png" alt="上传图片"><br>