如图,AB为半圆O的直径,现将一块等腰直角三角板如图放置,锐角顶点P在半圆上,斜边过点B,一条直角边交该半圆于点Q.若AB=2,则线段BQ的长为( )https://bgk-photo.cdn.bcebos.com/4afbfbedab64034f45a05f66bfc379310a551d64.jpgA、spanB、https://bgk-photo.cdn.bcebos.com/3812b31bb051f81948db1b2bcab44aed2f73e7d1.jpgC、spanD、https://bgk-photo.cdn.bcebos.com/8644ebf81a4c510fc952fa7b7059252dd42aa538.jpgE、spanF、https://bgk-photo.cdn.bcebos.com/6f061d950a7b02089e37278072d9f2d3562cc8d1.jpgG、1