單位是毫米制，密度改成t/mm3，出現(xiàn)以下錯(cuò)誤：THE ANALYSIS MAY NEED A LARGE NUMBER OF INCREMENTS (MORE THAN 20,000,000), AND IT MAY BE AFFECTED BY ROUND-OFF ERRORS. FOR ACCURACY, RUNNING DOUBLE PRECISION EXECUTABLE IS REQUIRED。不知如何解決，望知道的大佬幫忙解決一下，不甚感激！拜托？