零边际成本。
因为风是免费燃料，所以风能的边际成本几乎为零。
The marginal cost of producing wind power is almost nothing, since the fuel—wind—is free.
高科技企业科技要素投入的边际递增性和边际成本趋于零；
The margin income and margin cost of technology element are zero;
高科技企业科技要素投入的边际递增性和边际成本趋于零；
The margin income and margin cost of technology element are zero;
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