产地Ai | 销地Bj | 产量 | |||
1 | 2 | ∙∙∙ | n | ||
1 | c11 | c12 | c1n | a1 | |
2 | c21 | c22 | c2n | a2 | |
|
| ||||
m | cm1 | cm2 | cmn | am | |
销量 | b1 | b2 | ∙∙∙ | bn |