下列作图语句正确的是( )
A:以点O为顶点作∠AOB
B:延长线段AB到C,使AC=BC
C:作∠AOB,使∠AOB=∠α
D:以A为圆心作弧
物体A静止在水平桌面上如图所示.若把A稍微向右水平移动,则A对桌面的压力F、压强p的变化情况是( )
从方框中选词并用其适当形式填空
wear sing hear watch help
(1)Tony likes music and he likes ____.
(2)Be quiet! Can you ____ someone is singing a song?
(3)Tom’s aunt always ____ T- shirts.
(4)The family like ____ TV at home together.
(5)Li Lei always ____ others.
已知,正六边形ABCDEF在直角坐标系内的位置如图所示,A(﹣2,0),点B在原点,把正六边形ABCDEF沿x轴正半轴作无滑动的连续翻转,每次翻转60°,经过2015次翻转之后,点B的坐标是____.