粮食产量大幅度提高的主要原因有两个，一个是化肥，一个是农药

来源: kent928 于 2018-06-14 22:01:05 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.

Change Ad Consent