如图,PC切⊙O于A ,PO的延长线交⊙O于B,BC切⊙O于B,若AC∶CP=1∶2,则PO∶OB等于 ( )A.2∶1B.1∶1C.1∶2D.1∶412题
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![如图,PC切⊙O于A ,PO的延长线交⊙O于B,BC切⊙O于B,若AC∶CP=1∶2,则PO∶OB等于 ( )A.2∶1B.1∶1C.1∶2D.1∶412题](/uploads/image/z/13712663-47-3.jpg?t=%E5%A6%82%E5%9B%BE%2CPC%E5%88%87%E2%8A%99O%E4%BA%8EA+%2CPO%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%A4%E2%8A%99O%E4%BA%8EB%2CBC%E5%88%87%E2%8A%99O%E4%BA%8EB%2C%E8%8B%A5AC%E2%88%B6CP%3D1%E2%88%B62%2C%E5%88%99PO%E2%88%B6OB%E7%AD%89%E4%BA%8E+%EF%BC%88+%EF%BC%89A.2%E2%88%B61B.1%E2%88%B61C.1%E2%88%B62D.1%E2%88%B6412%E9%A2%98)
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