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在一个分析周期内，按一定程序不断改变固定相的浓度配比，称为梯度洗脱。()

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选一样品中不含的标准品，加到样品中作对照物质，对比求算待测组分含量的方法为外标法。()

equity grants made to them. Add these in that, and pay is still soaring. say critics. Who

measured ex ante (valuing options of using the Black-Scholes formula, rather than by what they later turn out to be worth when they are exercised) and in real terms, for firms in the S&P 500 index, average chief-executive compensation peaked in 2000, and has since fallen by about a third.

质谱可以用来测定样品中的水分含量。()