It is suitable for the trace analysis of volatile and semi volatile organic compounds in food, environment and biologic samples.

适用于食品、境、物样品中挥发性及半挥发性有机物的痕量分析。

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Therefore, the rapid, sensitive and stable semi-nested PCR are the effective methods for detecting trace bovine and sheep derived materials in feedstuff.

该技术具有快速、灵敏和结果稳定的特点，是检测饲料中痕量牛羊源成分的一种有效方法。

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Non-linear equations are(constructed) with the restriction of the satellite ground trace to resolve the unknown semi-axis and inclination, but it's too complicated to be resolved directly.

以轨道半径和轨道倾角为未知量依据星下点轨迹要求条件构建了非线性方程组，但直接求解过于复杂，采取迭代的方法解决。

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