The characteristics of mathematics and mathematics study, the historical-geneticprinciple, constructivism provide the theory support for this research.
数学和数学学习的特点、认知的历史发生原理、建构主义学习理论等都为本研究提供了理论支持。
2
The invention adopts quality description geneticprinciple to improve the breed and quality of the duck, it is simple, scientific, advanced, and with great spread application value.
本发明利用质量性状遗传原理，进行鸭的品种品质的改良，方法简单、科学、先进，有很好的推广应用价值。
3
We know fidelity is an essential principle of genetic transmission.