...二版 Ch.7 运输与指派问题 p.8/62 LP 两类限制式： 供给限制式（supply constraint） 需求限制式（demand constraint） 任何符合此特殊形式的LP问题，不论其实际意 义为何，均可称为运输问题 Min 1 1 m n ij ij i j Z c x 1 1 1, 2...
The demandconstraint is a little bit different than the previous two, because it's defined for each kind of toy, not as a total for all toy types.
需求约束与上面两个约束有所不同，因为它是为每种玩具而定义的，而不是为所有玩具类型总和进行定义的。
2
The main problem is a severe capacity constraint that does not allow the Railways to carry more freight even when there is demand.
主要问题在于严重的运能限制，因此即便有需求时，铁路也无法输送更多货物。
3
On-demand manufacturing could eliminate that constraint, leading to a world where products are always available, nothing ever gets discontinued, and the virtual shelves are always stocked.