Accordingly, the two different lever classes pre-experiment have no marked difference or they minimize the difference pro-experiment.
试验前有差异的两个班，在试验后没有显著差异或差异度减小。
2
Objective To explore the active constituents in different parts from the root, stem and leaf of Zantedeshia aethiopica by pre-experiment.
目的通过预试验，研究马蹄莲根、茎、叶三个部位可能的化学成分，以寻找有效成分的主要存在部位。
3
Therefore, based on the principle of the dissolution in the similar material structure, the better solvents were firstly decided through pre-experiment.