Gum rosin is a kind of natural resin with high economic value.

松香是一种具有重大经济价值的天然树脂.

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Gardner chromaticity value and color grade of solid gum rosin was determined a Lovibond automatic colorimeter.

采用罗维邦自动比色仪可以直接测定固体脂松香的加纳色度值和颜色级别.

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State on quality of Chinese gum rosin from 1995 through 2002 was investigated in detail.

从各种不同渠道详细调查了1995年至2002年中国脂松香的质量状况.

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