摘要： Let N be the set of pairs (k,l ) ∈ (N ∪ {∞})2 such that on some infinite electric network, wired spanning forest has l trees almost surely, while free spanning forest has k trees with positive probability.It's proved that N = {(k,l ) ∈ N2 | k ≤ l } ∪ {(∞,∞) } ∪ {(k,∞) | k ∈ N } .