【摘要】 应用投影变换原理 ,结合一定的逆向思维方法 ,可以精确求解空间一定度数的角度的投影问题。更多还原

【Abstract】 When we solute some space questions by the method of normal thinking projection change, that is very difficult. But if we make use of combining the method of counter thinking with projection change and another method cleverly, we can easily solute those difficult space questions.更多还原