例1 如图所示,已知∠AOB的两边OA、OB均为平面反光镜,∠AOB=40°.在OB上有一点P,从P点射出一束光线经OA上的Q点反射后,反射光线QR恰好与OB平行,则∠QPB的度数是 ( )A.60° B.80° C.100° D.120°
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![例1 如图所示,已知∠AOB的两边OA、OB均为平面反光镜,∠AOB=40°.在OB上有一点P,从P点射出一束光线经OA上的Q点反射后,反射光线QR恰好与OB平行,则∠QPB的度数是 ( )A.60° B.80° C.100° D.120°](/uploads/image/z/200930-50-0.jpg?t=%E4%BE%8B1+%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%B7%B2%E7%9F%A5%E2%88%A0AOB%E7%9A%84%E4%B8%A4%E8%BE%B9OA%E3%80%81OB%E5%9D%87%E4%B8%BA%E5%B9%B3%E9%9D%A2%E5%8F%8D%E5%85%89%E9%95%9C%2C%E2%88%A0AOB%3D40%C2%B0%EF%BC%8E%E5%9C%A8OB%E4%B8%8A%E6%9C%89%E4%B8%80%E7%82%B9P%2C%E4%BB%8EP%E7%82%B9%E5%B0%84%E5%87%BA%E4%B8%80%E6%9D%9F%E5%85%89%E7%BA%BF%E7%BB%8FOA%E4%B8%8A%E7%9A%84Q%E7%82%B9%E5%8F%8D%E5%B0%84%E5%90%8E%2C%E5%8F%8D%E5%B0%84%E5%85%89%E7%BA%BFQR%E6%81%B0%E5%A5%BD%E4%B8%8EOB%E5%B9%B3%E8%A1%8C%2C%E5%88%99%E2%88%A0QPB%E7%9A%84%E5%BA%A6%E6%95%B0%E6%98%AF+%EF%BC%88+%EF%BC%89A%EF%BC%8E60%C2%B0+B%EF%BC%8E80%C2%B0+C%EF%BC%8E100%C2%B0+D%EF%BC%8E120%C2%B0)
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