The windows and doors come from old buildings around her town that _______.
A:pull down
B:were pulled down
C:pulled down
D:was pulled down
“己所不欲,勿施于人”的实质是( )
已知矩形ABCD的长AB=4,宽AD=3,按如图放置在直线AP上,然后不滑地转动,当它转动一周时( A---A/),顶点A所经过的路线长等于____。