1. 請問藍球運球時是不是行一步拍一下?還是行2步內拍一下?
Sure you can, as long as you keep your hand above the ball, sometimes even 3 steps are ok because it is just you run fast.
2. 那如果你站著時可不可以不斷拍球?
YES, you should always try to keep your dribble alive.
3.另外,當我用雙手接到球時,可不可以再拍球?那會不會「得步」?
Yes, as long as you have not 拍球 yet. 得步 is Double, it is not a chinese term, technical name is Double Dribble = meaning you dribble once, then you pick up the ball (stop dribbling), then start dribble again.