A:throw away
B:get away
C:get away from
D:get away with
如图,△ABC的三个顶点的坐标分别为A(﹣3,5),B(﹣3,0),C(2,0),将△ABC绕点B顺时针旋转一定的角度后得到△DBE,且使点D落在y轴上,与此同时顶点E恰好落在y=kx的图象上,则k的值为( )
①钛合金②石墨③乙酸④稀有气体⑤硝酸钾