学科学习成就对研究性学习效果没有影响。
Subject learning achievement has no influence on project learning effects.
喂料速度对压块效果基本上没有影响，但速度过快会发生压块机进料口堵塞，速度过慢，生产效率太低。
The ration adding velocity had no significant effect on pelleting, but low adding velocity led to poor production efficiency, while high adding velocity caused frequently choke.
结果表明：碳化压力、织物结构、材料尺寸、材料密度、碳化时间的长短等因素对致密化效果都有影响。
Research results show that the densification efficiency is influenced by carbonization pressure, fabric structure, material size, material density, carbonization cycles and etc.
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