Kate was not sure_______.
A:that she should go through the third gate
B:if she should go through the third gate or not
C:which gate should she go through
D:which gate she should go through
俗话说:“人有人言,兽有兽语”.下列“行为语言”能在同种个体间传递信息的是( )
如图,线段AB两个端点的坐标分别为A(6,6),B(8,2),以原点O为位似中心,在第一象限内将线段AB缩小为原来的12后得到线段CD,则端点C的坐标为____ .
若sinα=-513,且α为第四象限角,则tanα的值等于()