在预备试验的基础上，对塑料大棚清洗装置进行了结构设计和尺寸确定，并对样机进行了试验。
Based on the prepared experiments, the plastic greenhouse cleaning device structure was designed, the size was determinated, and the cleaning prototype was tested.
预备试验规模太小而不能在统计学方面使得这个重要的结果成立，而且两种人的混合也使试验更加复杂了。
The pilot study was too small for statistically significant conclusions to be drawn from it and was complicated by the combining of two different populations.
在预备性实验基础上，采用二次正交旋转组合设计对粉煤灰水泥刨花板进行工艺试验。
Technological experiment of fly-ash cement particleboard was processed with the mathematical model of "Quadratic Orthogonal Rotational Combination Design", based on the preliminary experiment.
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