odd-even predominance of n-alkane
正烷烃奇偶优势
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正构烷烃偶奇优势指数 even-odd predom index
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口井30 余块样品测试结果表明，煤系有机质丰度及可抽提有机质的量都较高；正构烷烃具明显奇偶优势；
The test results of 30 samples collected in 4 wells indicate that the abundance and extractable contents of organic matter in the coal measures are both high, n alkane possesses odd even predominance;
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