本研究制定了正确的核桃优树选择程序和方法，提出了坚果品质和产量并重的决选原则。

This paper has worked out the correct procedures and methods of the selection of the fine trees of walnut and has set the principles of stressing both t.

youdao

本研究制定了正确的核桃优树选择程序和方法，提出了坚果品质和产量并重的决选原则。

This paper has worked out the correct procedures and methods of the selection of the fine trees of walnut and has set the principles of stressing both t.

youdao