测得某同学身高1.65m,下列说法中正确的是( )
It was ____ dark here ____I couldn't see anything.
如图,在△ABC中,AB=AC,BC=12,tanC=43,如果将△ABC沿直线l翻折后,点B落在边AC的中点处,直线l与边BC交于点D,那么BD的长为____ .