A:Actions speak louder than word
B:All work and no play makes Jack a dull boy
C:All roads lead to Rome
D:A good beginning is half done
在平面直角坐标系中,将线段OA绕原点O逆时针旋转90°,记点A(﹣1,3)的对应点为A1,则A1的坐标为( )
若f′(x0)=﹣3,则limh→0fx0+h-fx0-3hh=( )
事实上确立了以***为核心的党中央的正确领导,成为党的历史上一个生死攸关的转折点的会议是