在图机构中，曲柄OA以匀角速度ω0转动，且OA=r，又AB=AC=r。当曲柄OA与连杆AB位于同一铅垂线上时，OA⊥0C，此时连杆AB的角速度为（　　）。题53图

B、<img width="36" height="39" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/160af483-c949-4b6a-be77-853cc4ea4ebc.png" /><img width="14" height="18" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/4c5710b6-d2e2-48f6-b5f6-fb68096983df.jpg" />

C、<img width="34" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/89051777-8309-4601-8fc4-4e93514a58dc.png" /><img width="13" height="16" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/c7b962ca-16a0-4b48-b4f2-3329bdf16c6c.jpg" />

D、ω₀