从范德瓦尔斯方程出发，利用牛顿迭代法，求解对应材料的binomal线和binomal线，给出相应的相图，并作出对应的P-T图像。(Starting from the Van Der Waals equation, using the Newton iterative method, the binomal line and the binomal line of the corresponding materials are solved, and the corresponding phase