对影响误差的因素进行了分析，并用校核实验验证了装置的准确性和精确性。
The effect factors of error were analyzed, and the accuracy and precision were verified by checkout experiment.
针对柴油机（4 85 ）低频排气噪声，对其产生机理、规律及其影响因素等作了理论计算、分析及实验。
The low frequency exhaust noise of a diesel(4 85), its generation, frequency characteristics and influencing factors have been studied through theoretic calculation, analysis and experiment.
设计：单因素方差分析(分组对照实验)。单位：一所大学的营养与代谢性疾病实验室。
DESIGN: Single factor analysis of variance (a case-controlled study) SETTING: Laboratory of nutrition and metabolism diseases in a university.
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