They are simple methods, but will be helpful in determining the state of the back and forward buttons.
这些方法很简单，但是确定后退和前进按钮的状态时很有用。
According to the property of the singular points, we construct a direct methods for Determining the positions of a class of turning simple bifurcation points.
对一类具有转向性质的简单分支点，从方程本身出发，根据奇点的性质，构造出确定奇点位置的直接方法。
According to the property of the singular points, we construct a direct methods for Determining the positions of a class of turning simple bifurcation points.
对一类具有转向性质的简单分支点，从方程本身出发，根据奇点的性质，构造出确定奇点位置的直接方法。
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