first order second moment

• 一次二阶矩

First order second moment的用法和样例：

例句

1. The parameters of the model are fuzzily processed and the fuzzy risk can be evaluated by using the modified first order second moment method.
   通过对模型中的参数进行模糊化处理，用改进一次二阶矩法计算了地下水过量开采的模糊风险率。