This lesson chiefly describes a unity problem of patent application of fertilizer invention.

这一讲着重介绍了肥料发明专利申请文件的单一性问题。

youdao

This lesson chiefly describes a unity problem of patent application of fertilizer invention.

这一讲着重介绍了肥料发明专利申请文件的单一性问题。

youdao