引用本文: | 张晨东. 中美两国马里兰烟分级标准比较与分析*[J]. 云南农业大学学报(自然科学), 2006, 21(6): 770-774. |
Citation: | ZHANG Chen-dong. Comparative Analysis of Standard Grades for Maryland Tobacco in U S A and China[J]. JOURNAL OF YUNNAN AGRICULTURAL UNIVERSITY(Natural Science), 2006, 21(6): 770-774. |