图示均质圆盘质量为m,绕固定轴O转动,角速度均为w。对转轴O的动量矩LO的大小和方向为（）。<img src="/lqwvjeImg/ee/ee4f5c50bbf18071b6cf4dcc3e0254e5.jpeg" style="width:191px;height:158px;"><br>·LO=mr2w(顺时针方向)<br>·LO=<img src="/lqwvjeImg/a0/a0539226eebe908db29b61eed2c998cf.jpeg"style="width:30px;height:67px;">mr2w(顺时针方向)<br>·LO=<img src="/lqwvjeImg/e1/e1e8fe48f51c41bef945dfff3807fc8d.jpeg"style="width:32px;height:59px;">mr2w(顺时针方向)<br>·LO=0