— Great ! Patients here ____good treatment.
根据录音,判断句子是否正确。I didn't like dogs before,but I'm happy to have one now.
如图,在直角坐标系中,四边形OABC是直角梯形,BC∥OA,⊙P分别与OA、OC、BC相切于点E、D、B,与AB交于点F.已知A(2,0),B(1,2),则tan∠FDE=____.