15N丰度
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n abundance n丰度
natural n abundance n天然丰度
natural n abundance method n天然丰度法
15 n abundance N丰度
15 n-abundance n丰度
isotope n abundance n同位素丰度
natural 15 n abundance n天然丰度
measurement of n abundance N丰度测定
natural 15 n abundance method n天然丰度法
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;
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；
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