John Snow____(照顾)Queen Victoria as her personal physician.
如图,直角梯形纸片ABCD中,AD∥BC,∠A=90°,∠C=30°.折叠纸片使BC经过点D,点C落在点E处,BF是折痕,且BF=CF=8.(1)求∠BDF的度数;(2)求AB的长.
判断对错
13-3+7=3
— What can I do for you, sir?
— I'd like two ________.
1米比80厘米长____%.