4 E( `+ K! O( n' b, D* I& V帮助文件这个目录下有讲解的: " W" x% r9 w9 |Reference Help > Material Flow Objects > Shared Properties of the Material Flow Objects > Attributes of the Material Flow Objects > Attributes for Setting Times of the Material Flow Objects' g/ g* P' U# p# ^2 Z4 x