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Viscometry is an easy measurement, suitable for practic al production, when 29Si-NMR is more accurate. 粘度法具有簡便易行的特點(diǎn)，適于實(shí)際生產(chǎn)應(yīng)用，而核磁法所測相對分子質(zhì)量較為準(zhǔn)確。