用于地球物理勘探钻井和爆炸两个班报的因素对比，选出不同因素的钻井好爆炸-Drilling and geophysical exploration for the explosion of two classes of factors reported contrast, the drilling of different factors to elect a good explosion

给定x的值，可得到需要的勒让德函数值，在地球物理反演，卫星重力数据计算上有较大用途-Given the value of x can be obtained in need Legendre function value, in geophysical inversion, calculation of satellite gravity data, a greater use of