短語詞組短語sliding mode surface 滑模面integral sliding mode surface 積分滑模sliding constraint surface 滑動約束表面sliding slope surface 滑坡面sliding contact surface 滑動接觸表面sliding g surface 滑動面variable sliding -surface 變滑模面modified integral sliding mode surface 改進型積分滑模面composite sliding surface 復(fù)合滑動面 返回 sliding surface