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    图中各杆均为均质杆。已知杆 OA , CD 质量均为 m ,杆 AB 质量为 2 m ,且 OA = AC = CB = CD = L ,杆 OA 以角速度 w 转动,则图示瞬时, OA 杆对 O 点动量矩的大小为 _______________________ ; AB 杆对 C 点动量矩的大小为 ____________________ ; CD 杆对 D 点动量矩的大小为 _________________________ ,转向均应在图中标出。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201901/abfa22ff9fe64c3eaae2cae0501521ef.png
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