经过大量试验合成了一种低毒改性脲醛树脂。
A kind of modified low toxic urea-formaldehyde resin was synthesized.
经过大量试验和现场测试证明这些理论是正确的。
The theory is proved to be correct through a lot of experiment and spot tests . There are two parts in this paper.
并对生产原理做了进一步探讨，经过大量试验找到最佳反应条件。
We further discusses the producing principle. After the massive experiments finding the best response condition.
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