关于电场强度的下列说法中正确的是（   ）

阅读短文，在横线上写出孩子们毛衣的颜色。

    Kate, Jim, Rose and Bill put their sweaters on the table. The sweaters are white，blue, red and black. We know the boys' sweaters aren't red and the girls' sweaters aren't black. What color is Kate's sweater? I don't know. But I know it is not blue.  Bill says, “My sweater is white”. Do you know what colors their sweaters are?

如图，在平面直角坐标系xOy中，点A（1，0），B（2，0），正六边形ABCDEF沿x轴正方向无滑动滚动，保持上述运动过程，经过（2014，$\sqrt{3}$）的正六边形的顶点是（　　）

我们把两个（或两个以上）的____，就组成了一个一元一次不等式组．