Escape velocity is simply the speed of an object that's shot out of a cannon the minimum initial speed so that the object could later escape Earth's gravity on its own.
Third, argument-polar radius curve of polar coordinate system whose pole is geometric gravity is formed, and maximum and minimum value points are searched.
然后以重心为极点，对边缘点极坐标化，形成幅角-极径曲线，在该曲线上寻找局部极大极小值点。
3
METHODS: The minimum loading capacities of ulcer paste, crystal ointment and zinc oxide liniment were examined by specific gravity method, capacity substitution method and capacity addition method.