A:①③
B:①②
C:①②③
D:①②③④
如图,在平面直角坐标系中,直线y=﹣3x+3与x轴、y轴分别交于A、B两点,以AB为边在第一象限作正方形ABCD,点D在双曲线 y=kx (k≠0)上.将正方形沿x轴负方向平移a个单位长度后,点C恰好落在该双曲线上,则a的值是( )
判断正误。
I like Chinese music. I don't like pop music. Because I think pop music is not quiet. I can play the zither. My sister can play the zither, too . But she's better than me. We can play the erhu. I am better than my sister.
我国铁路运输在各种运输方式中的地位异常突出,下列现象与此关系最小的是( )