设计中存在的主要问题包括隐层神经元数、中心和半径的确定，以及网络权值的训练。
The main problems in designing a RBFNN depend on fixing the nodes of the hidden layer, the parameters of the centers and the linear weights.
如果你以北极点为中心开始画圆，那么半径和半个子午线相等的圆周就是赤道，它包含的区域就是北半球。
If you start from that North Pole as centre, then the circle with radius equal to a half meridian is the equator, and the area included is the northern hemisphere.
给出了非圆齿轮的节曲线极坐标方程，两齿轮中心距的计算方法，节曲线长度、基础圆半径和压力角的计算公式。
The polar equation of non-circular gear pitch curve, calculation method of center distance, formula of pitch curve length, primary circle radius and pressure Angle is given.
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