问题4： 你能否估计一下这个问题 66 规模”有多大？ 1000prodvariables:n for each combntion of a pat,machne,produt and month 1,000 inventory variables:one for each combination of a plant,product,and month 1,000 sales variables:ne for each combination of a plant,product,and month shipping variables:n for each ombination of a produt,month,plant (the fromplant),and another plant (the toplant)