如图所示的机构中,若取OA杆上的A点为动点,动系与CB杆固连,定系与机座固连。已知转动的角速度为ω,OA=,则当OA杆与CB杆垂直时,该瞬时动点A的相对速度为( )。

A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15234952230165fd8cb5cdb7144a2ae8e2f02692c41c5image12.jpeg">

B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15234952231008439921896774155bb7651a12f4d2a3aimage13.jpeg">

C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/152349522318566166a14a03447838db84e50d286e353image14.jpeg">