2021—2025 年度，无论披露研发投入的企业数量/占比，还是研发投入总额/平均值，都呈整体上升趋势。
11) Can i mint NFT for free?To mint an NFT token, you must pay some amount of gas fee to process the transaction on the Etherum blockchain, but you can mint your NFT on a different blockchain called Polygon to avoid paying gas fees. This option is available on OpenSea and this simply denotes that your NFT will only be able to trade using Polygon's blockchain and not Etherum's blockchain. Mintable allows you to mint NFTs for free without paying any gas fees.
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