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Drill cuttings are the major material for the studied samples.
研究的材料主要是钻井岩屑样品。
youdao
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Coal is main mineral resources of China and major material in chemical industry.
煤炭是我国主要的能源矿产资源，也是重要的化工原料。
youdao
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Coal is main mineral resources of China and major material in chemical industry.
煤炭是我国主要的能源矿产资源，也是重要的化工原料。
youdao