常見例句雙語例句The"311-A"regression design was adopted to study the optimum ratio of N, P and K fertilizers on maize field of Yellow River Pumping Irrigation District in Cheng Xitan, Yanchi Ningxia.運用“311-A”試驗設計，探討寧夏鹽池縣城西灘揚黃灌區(qū)玉米氮、磷、鉀肥料的最佳配比。 返回 yellow-river irrigation district