为了实时获得原油分馏中待控质量指标的可靠数据，保证先进过程控制的应用效果，建立了分馏过程侧线质量指标的在线观测计算系统；
On line observation of quality control is a pivotal task for Advanced Process Control(APC). The on line observation system of crude tower side draw quality control for APC was built.
科学观测和计算的准确性，总是受制于科学家的计时方法。
The accuracy of scientific observations and calculations is always at the mercy of the scientist's timekeeping methods.
科学家计划实验、计算、观测以检验假定。
The scientist plans experiments, performs calculations, and makes observations to test hypotheses.
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