Monday, March 25, 2024
问题:下列哪种肥料容易挥发()A、氮肥B、磷肥C、钾肥D、有机肥
Friday, January 12, 2024
Friday, January 12, 2024
问题:温室效应指透射阳光的密闭空间由于与外界缺乏热交换而形成的保温效应。
Wednesday, September 14, 2022
Saturday, February 24, 2024
Friday, March 29, 2024
Monday, September 12, 2022
问题:土壤表土耕作的措施包括()A、耙地B、中耕C、镇压D、起垄E、作畦
Wednesday, February 14, 2024
问题:下列作物哪些属于我国华北平原适宜种植的作物?()A、春小麦、春玉米、马铃薯B、冬小麦、夏玉米、棉花C、橡胶、水稻、油菜D、冬小麦、甘蔗、甜菜
Friday, March 29, 2024
Monday, September 12, 2022
Wednesday, December 7, 2022
Thursday, April 27, 2023
Wednesday, September 14, 2022
问题:在长期的土壤耕作中,土壤剖面在上而下可以划分为四个层次,分别为()、()、()和()。
Sunday, December 10, 2023
Saturday, February 24, 2024
Thursday, May 4, 2023
Monday, September 12, 2022
Friday, November 4, 2022
Thursday, February 1, 2024
问题:从播种面积看,()、玉米是我国播种面积占第二位和第三位的作物。A、小麦B、马铃薯C、黑豆D、燕麦
Monday, March 25, 2024