A:杂交、自交、测交、测交
B:测交、杂交、自交、测交
C:测交、测交、杂交、自交
D:杂交、杂交、杂交、测交
阅读理解,根据短文选择正确的一项。
One day Mr. and Mrs. White went shopping by car. They stopped their car near a store. They bought a lot of things and they wanted to put the things in the car. But Mr. White couldn't open the door of the car, so they asked a policeman to help them. The policeman was very friendly to help them. Just then a man came up and shouted:“ What are you doing with my car?” Mr. and Mrs. White took a look at the car's number and they were frozen(僵住了) there. It wasn't their car.
关于速度和加速度的下列说法中,正确的是( )
如图,已知Rt△ABC中,∠ABC=90°,先把△ABC绕点B顺时针旋转90°至△DBE后,再把△ABC沿射线AB平移至△FEG,DE、FG相交于点H.